Emu not working

[Angelus636]

Hello, i'm beginner about this emulator stuff..
so i downloaded some games:
Guitar_Hero_5_USA_Wii-SUNSHiNE
[WII]Wii Sports Resort [PAL][ESPALWII.com]
[GameCube][PAL].Pokemon.Colosseum.iso

but none of them worked :S
one game shows black screen, one some kind of error and one shows numbers

and now i;m downloading:
[Wii]Need_For_Speed_Undercover[PAL][ESP-ITA][ESPALWii.com].rar

can someone help me, why games not working?