Wargames are relatively expensive, but some of the big names can be tried for relatively cheap. Warmachine and Hordes have $40 faction starter boxes that come with absolutely everything you need to play (except an opponent with their own force). You'll probably spend more if you end up liking it, but you can go in at a reasonable pace, spending $10 here and there, occasionally another $40 box. And if you're playing at a store, the store often has mats and terrain on hand for you to use so you're not stuck using the tiny playmat that comes with the starter boxes.

That said, if cost is a real issue for you, try roleplaying games. The bog standard Dungeons & Dragons has all of it's 5th edition core rules (thought not all of it's optional ones) available for free via it's System Resource Document, released under the Open Gaming License.

Polyhedral dice are cool, but there are any number of diceroller apps you could use for free. I'm partial to PrimeDice.

All you need is a pencil and paper - even that's optional if you want to use a character sheet app or fillable .pdf.

>make them like lv4.5 with a bonus to their rolls

How come I did not think of this ? This is a really great idea. I am definitely going to use this. And modify my program and test that solution and make more stat charts.

>I downloaded a free dice roller on my phone to use

About that, this one is really nice. You can have several tables to roll the dice (so you don't need to reconfigure every time you switch LVLs). It does not allow you to add a bonus to the dice result though. Which one do you use ?

there's also

Prime Dice D&D

Which should let you roll pretty much any kind of dice you want. The only thing I don't think it does is add bonuses. But it's very flexible.

Hmm.. I rock that Android side of the market and here are my essentials

Gaming

Mostly board/card but you can use these for other situations as well

1. Prime Dice - If you game at all this isa great free dice rolling app
2. Sentinels Randomizer If you play Sentinels of the Multiverse this is an awesome random setup app
3. Select Who - an excellent randomizer to pick who goes first.
4. Chwazi - another who goes first app that's even better
5. Magic Life Counter - Great life counter for games. Are youplaying a game where you and someone else have lives... use this.
6. Codenames Timer - this timer is made for the board game Code Name but it's also a really good (two team) timer. Make sure each team only uses five minutes or whatever per turn.
7. Dehumanize your friends - Cards Against Humanity is one of the worst games I've ever played of all time literally. #NoHyperbole. That said there are still people who insist on trying it because they've heard how fun it is. These are the uninformed. It's your duty to inform them. The best and most fair way is to actually play it. This app lets you do that with a Chromecast. It's fast to setup, it shows how utterly boring the game is, how nothing changes from start to finish it's literally the same gamestate. And then you can stop and never have to play it again. All that and you didn't have to buy it or spend 40 minutes cutting out tiny squares.

Techhead

These are apps for the "Computer Pro" among us. If you've ever had to diagnose a broken internet connection over the phone with a relative.. this is for you

1. ~~Google Authenticator~~ - a great Two Factor Authenticator but it's been replaced
2. Authy - So much better.. i didn't want to change but I now love it.
3. total Commander - ACTUAL access to your file system. So much better cleaner than whatever "File Explorer" comes with your phone.
4. DiskUsage - Why is my phone full? Find out here..
5. Barcode Scanner - because scanning QR codes is always handy when you least expect it
6. AirDroid - among the many very cool things this does is hm.. actually I replicated that in PushBullet but the OTHER cool thing is that I can access my file system wirelessly. A very nifty trick
7. GOM Remote - My video player of choice is GOM because i love the Easy Browser. This is an awesome remote for your phone. Perfect for when I have my laptop hooked up to my TV.
8. Swype - of the major free keyboards Swype is the one I choose. I paid for the proversion
9. IFTTT - a swiss army knife app. Check the website IFTTT.com for proper details. It's macro on steroids
10. PushBullet - push links from computer to phone, no more tiny URLing or emailing to yourself. Also get your phone's notifications on your computer
11. Smart Unlock - You know what's annoying. Having to unlock your phone at home. I'm home. No one else is here (#ForeverAlone j/k). This unlocks your hone when you connect to your home WiFi. I suppose if you have random girls coming over all the time and you don't trust them for whatever reason.. but otherwise this is awesome.
12. Remote Desktop - because somehow somewhere somewhen you're going to need to get into your computer from your phone.

Media Stuff

music. it's music.

1. Shazam - We all have it. It's essential but well known
2. Rocket Player - my music player. The only thing it doesn't play are my FLACs
3. Cogi - voice recording app that lets you record from before you push start.
4. MX Player - sometimes I install this alternate video player though I haven't needed it much.

Social Stuff

Social Stuff, chatting, networks etc

1. Goodreads - more of a socialmedia recommendation but GR is awesome and their app has a barcode scanner that lets you scan a book and get info on it or add it to your shelf.
2. Slack - it's slack. Slack is awesome. Slack is life.
3. Telegram - What's App but better

OTHER

1. MoonReader - ebook reader so good I paid for the proversion (Hint it goes on half off sale every anniversaryseason and Christmas season so wait for that sale and buy it)
2. Zombies Run - I bought this on sale a while ago.. back many versions ago. It's a great fun running app
3. Pocket - push an article from your computer.. to your account to read later in a nice clean easy to read interface
4. Google Opinion Rewards - Let google pay you in play money. Works best in US if you have Location on all the time.
5. Moon Phase Pro - worth the small fee for so much info

Games

Yeah naw. I'm not really into mobile games in general because I think there are many basic principles of interface that are broken in a mobile phone platform. that said I do have a number of game that I play and a few of which that I enjoy.

1. Ingress - Alternative Reality Game, Google Based
2. Beat Hazard - turn your music (ANY music) into a shoot'em up game
3. Color Zen - color based puzzle game
4. Carcassone - board game adaption (BGA); tile laying
5. XenoShyft - BGA; co-op deckbuilding
6. CrossMe Premium - picross style puzzles
7. Elder Sign Omens - BGA; co-op dice game
8. Eufloria - combo puzzle/RTS
9. Hey, that's my Fish - BGA; area control
10. Lyne - puzzles; line based
11. Osmos - RTS, zen, puzzle
12. Plants vs Zombies 1 - I've put about 300 hours into this game. I play it on literally every platform I can. I just really like it.
13. Splendor - BGA; fun just fun
14. Threes - puzzle numbers strategy
15. BitTrip {Anything} - joy injected into your blood

Most of the games I play I got from HumbleBundle bundles or from back when Amazon used to give free apps weekly. Man those were good times.. I've played maybe 5% of the games I've bought so I have a long way to go. I'm busy doing Ingress (which is awesome) and TapTitans (Which I think I don't like)

Prime Dice is what I use for a roller on Android, though I don't use it for WMH.