There are 20 including the analog stick and the power and WLAN switch.
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If a game requires the R2 and L2 buttons, these are usually mapped to the PSP's analogue stick to the lower left of the screen.
There are no R2 and L2 buttons on the PSP. For any games that require them (usually converted PSX games), R2 and L2 are mapped to the PSP's analogue stick.
Warrock is a PC only game, the psp hasn't got enough buttons to be able to play warrock anyway.
The L1 button is the left 'shoulder' button. While the PSP doesn't technically have a L2, games that need it usually have it mapped to the PSP's analogue stick.
There is a smaller screen, the graphics aren't as good but still good, you can get glitches easier, and there are less options on games due to not as many buttons.