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Well depends on what you would like to mod! It could be CAS parts (like clothing and all), script modding, default replacements, CAW stuff... Enough to let your creativity flow
I should take a look at these pages first:
http://www.modthesims.info/forumdis...egory=CAS+Parts (In top yuou can switch from tutorial page, for example, from CAS parts to Modding - general) And this page:
http://www.modthesims.info/wiki.php...=Sims_3:Modding
Hope this helps you get started ^-^