>my G17 has a habit of dropping the mag after one or two shots...
Send it back to Glock, they will take care of you. Even if you aren't the first owner, they'll make it right.
> Shoot my balls off
If you really want to do this, post a video of your experience... /s
> Go watch a match
Fuck that. SHOOT a match. Most places will require you take a intro/safety class before you can shoot a match. Find the place closest to you that offers this course, and take it. In many cases, you can take a class and shoot the match the same day. So do it.
Your division is determined by how many mods you have on your G17. Unmodded? Production in USPSA or SSP in IDPA. You've got a match grade barrel, brass mag well, and/or other funky stuff done to your G17? Limited (or limited 10) in USPSA or ESP in IDPA.
So here's your marching orders:
Get your gun to Glock. They will make it right.
While your gun is in transit, use Practiscore to find out where matches are held in your area.
Go to that range's website and find out when they have their new shooter safety class. Sign up for that class.
If there is a match on that day, sign up for the match too.
Get a cheap holster and some mag pouches from Amazon. You'll need 1 of those mag pouches for IDPA, 2 for USPSA.
Go shoot. Preferably leave your testes intact.
After your first match, you'll know if these games are for you. If they aren't, you've got some cheap, spiffy cosplay gear.
If you are hooked, then get the real gear. I suggest https://benstoegerproshop.com/ to get yourself kitted out.
After a year, when you've gone up in classification, consider getting a new gun.
You'll want a holster so that if you're the range, out in the woods, shooting on a friends property, etc you can holster it while you hang targets. Sometimes it's just nice to have you hands free. I'd just go with a cheap Fobus paddle.
I personally love my Howard Lieght's which I double up with ear plugs underneath.
Go read the Glock Owner's Manual for maintenance, particularly where you need to lubricate. Glocks should be cleaned before first firing, but don't strip off the gold/brown grease because that shit is awesome. I clean my self-defense guns after every trip, it only takes 5-10 minutes per gun.
Other than night sights and/or flashlight for a HD gun, keep it stock. If you're a new shooter, the equipment will not limit you.