okay, the background picture is very easy to do.
are you familiar with myspace layouts?
it's kinda like that.
ya just need to find the url spot for it, and put in the url for whatever picture you want. the space is in parenthasis(sp?) <- like that. lol. it should be empty b/c you don't have a picture right now.
i believe that there will be three our four different url spaces. you just have to find the right one. the filled one should be your header.
and as far as colours go, ya just need to figure out which colours go where. it depends on which code you have as well, not every code on here is in the same format.
and i'm sorry if that's not very helpful. s'harder to explain than to actually do it...