New PPSSPP user here, in need of some help!

[GamerzHell9137]

1. The emu is gonna work fine, even a single core CPU can do the job fine. One of the most important things is the GPU and you have a beasty one which means you can do anything.
2. The default settings are the max you can go. Only way you could make the games look better is to increase the rendering resolution and use custom postprocessing shaders. If you feel like making your own you can use LunaMoo's customizable shaders http://forums.ppsspp.org/showthread.php?tid=6594
3.Nope, that's the only way.
4.The game supports almost all games, some of them don't work but most of them are Japanese Visual Novel games. Here's the compatibility list thou http://forums.ppsspp.org/showthread.php?tid=1473