I wanna know more about setting classes, can you help me by posting a small tuturial on this?
And also I can't change the skins cause when I do that and pass by them at the selection screen it stucks in that skin.

Incorrect version my ass! 
My version is 1.0, the client I'm using it's 3.0z, the server I try to connect are all 3.0z servers but still, a message shows up saying that I can't stay connected and that i have an incorrect version.
BTW I'm using a no cd patch but the first time i tried I was using a normal crack and it didn't even started up.
I play MTA all the time so it's no connection problem.
What can I do to fix this??