Never made any custom content before? Start with the easiest, most basic stuff (which you can make with all free programs) - Sims 2: Walls, Floors, and Ground Cover, Sims 3: Custom Patterns
Just installed the Sims 3 patch or about to? Read this article for helpful advice about patching and keeping your custom content working!
A group for people interested in 3D modeling of anything (not necesarily Sims 2) to learn about, get feedback on, give feedback on, and enjoy looking at pretty meshes. =D