help with the mac-on-mac app please

hey there, I recently bought a new system running os x leopard and silly old me thought that it would run all my old OS 9 games, probably should have done my homework on that one I guess. Anywho, I read that if I downloaded the mac-on-mac app I might just be able to run my old os games, so that's what I did. However, there is one slight problem: I am only semi computer literate and I don't have a fuffing clue what I'm doing with it, not one single iota. This probably sounds stupid to allot of you but I'm stumped. Could anyone please take the time to tell me;

1) Will mac-on-mac even do what I want it to do? i.e play a classic game that is not supported on my new godforsaken os x

2) If it will do what I want it to do, how do I actually make it do it? meaning what in gods name is all this x11 coding about?

thank you.

p.s I have also read about sheepshaver and it would be great if only I hadn't already sold my old machine along with the os disks

 

Yes, my new system is indeed power pc, i have it installed right now, i just don't actually know what to do with it!