Be careful m8, you will need to download an anti bricking file first. As there are several different ways of ruining your psp. Get the anti bricking file first, then search for homebrew games.
I used to mess around with the PSP. I had a Snes emulator on it. It got so annoying juggling playing the latest games (which update your PSP not to play homebrew stuff) or playing homebrew games, I gave up.