PSP - other function beside games?

I wish to know that the PSP - black version & Pink version
1) what difference between them? (beside colour)
2) Is it Black version can store more game?
3) How large memory stick can i use for both version?
4) 1games may use how large mamery to install it? o may i ask if only 32MB can i hav how many games inside?
5) & etc