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i'd recommend having a good read thru the XOOPS FAQ and the documentation site.
once you have read all that, then if ur still stuck.. ask a question, but make sure you ask specific questions and give as much details as you can about what you want to do..
of course what you want to do might all depend on how much knowledge you have in regard to php, html, css etc etc.. whilst the developers and members of this site will help you as much as they can, it is best to ask specific questions rather than broader questions..