if you want to go really cheap and basic, you can get a used Canon t3i for under $200 on mpb.com and pair it with a rokinon 8mm fisheye lens for another $120 or so. The flip out screen on the T3i will make it easy to see what you're filming. Also look into getting a handle along with a mic for audio quality.
If you want to spend a little more and get something kinda fancy, you can snag a used Sony A7S for around $500 on mpb as well and you'll get a full frame mirrorless setup. Add a 12mm rokinon lens to that for around $200 and you'd be pretty set. There's settings on the A7S that'll allow you to see if parts of what you're filming are overexposed, etc. You'll also have an extended ISO range over other cameras so you can film in lower light settings as well.
If you want to get really nerdy, you can film using S-log (same color gamut the primitive filmers use) and learn how to grade in post if you want good colors and don't want a super contrasty image where your highlights are blown out and your shadows are super dark. If you're just looking to film some shit with the homies, i wouldn't worry about any of this