Uhhh... 1. Read the manual, rules, and general information.
2. Use Project64 1.6 if you're just going to play the game, not NEMU.
3. All emulators have a configurable control scheme. Usually, it's under some sort of "Configure Input Plugin" menu, so look in there to set it to how you want it.
Next time, instead of asking a question by posting a whole new thread - search.