Just thought I'd share this with you:
http://sims.wikia.com/wiki/The_Sims_3
This is wikipedia for the sims. If you scroll down the main page you will see that it details the necessary specs, gives you an outline of the traits and how they affect gameplay, tells you about pregnancy, about all the skills and how to complete all the challenges (I find the fishing one, for baits; and the gardening one, for fertilisers and skill levels; and the handiness one particularly useful), what the different careers are and what levels of everything you need, what hours you will work and how much you will get paid.
Seriously, just check it out.