playstation emulator and roms...

im so tired of trying to get a playstation emulator to work, including the games. it seems totally different from nintendo, super nintendo, genesis, n64 or any of that. can someone please help me? i need the best emulator and a site with working roms, if someone could show me that, including how to get the roms to work on the emulator so i can play it. sorry to be a bother, but i just dont know what im doing to get them to work and need ur guys help...