question about editing themes? and php pages?

[destroyallantz]

hey all, i recently set up my new site and everything's been going very well but i do have a few questions. sorry if they've been asked before, but i didn't really know what to search to find my answers. :(

anyway, my first question is about the theme. i love the basic/main theme but i would like to edit the banner/colors and fonts and such, but i have no idea how to go about that. i know basic css so that's not a problem, but when accessing the theme editor from my admin cp i get the error: "SplFileObject::__construct(/home/moon000x/public_html/templates/main/style.css): failed to open stream: No such file or directory". how would i go about fixing this, as well as making other minor edits to the theme?

my second question is about editing the text from .php pages. you know, like the trade, messages, account, and inventory pages. how would you do this?

thanks for any help, it's greatly appreciated !