Since this part of the forum is usually reserved for any General/Technical help with the game itself, not to mention a lot of people don't know where to post their questions for creating Sims 2 custom content, here's the link to one of this site's oldest "hidden" treasures:
insimenator.org's Modding sectionFeatures Tutorials, direct help, tips, resources, and support with content creation... even help with modding. Your best bet for getting good support for any of your creation-related help topics would be to ask us in the related forums.