You can use your mobile phone. Use RedditIsFun or Apollo to. post, both use IMGUR natively.
I've been using this Huion tablet for 3-ish years, and it's a really good starting tablet! For like $40 you get a nice tablet and some bonus stuff, with a major plus being the wireless battery free pen. Just don't buy tablets that get any cheaper than that, they'll either be uncomfortably tiny or break down quickly.
The software I use is Clip Studio Paint EX. It's even better than Photoshop as an art program (you can even use it to animate!), and it'll be cheaper than Photoshop in the long run. CSP EX is $200+ however, but I got my copy for about $100 from a holiday sale, and the highest discount I've seen is 60% off. High price tag aside, CSP is absolutely worth it.
If you don't wanna shell out that amount of money tho, I started off using Medibang Paint Pro, a free program that's admittedly lacking and clunky but it gets the job done.