Requirments For Homebrew

Hey what do i need to get to use gba emus and play gba games?i have custom firmwire 3.71 m33-4 and i have a 8 gig mem stick so anything more i need??? if no how do i use gba games it gives me an error when i try:(
Answer #1
You have correct firmware… just get correct emulator and do exactly as said in ‘readme’ file (You have to copy it to certain folder.. GAME150 i think).
Or try some diff emulators (i’ve had probs with that thing too).
Answer #2
wher can i get the bios?
Answer #3
Requirments For Homebrew
Hops
yeast
malt extract
……
Oh, you weren’t referring to beer.