When your in the build mode, just click on the floor boutton in the bottom left with the up arrow.
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You have to go to the build section and buy stairs and then you have to make a floor.
Unless there is a mod to change this, you cannot make your sim just sit on the floor. The "Hang Out" option will sit them on the floor but that is two sims "hanging out" and talking on the floor...they do not just idly sit there.
I don't really understand you but there are 3 sims game: The sims,The sims 2 and The sims 3. So maybe sims 2? Or, there have been expansions sims 3 world adventures was first so that could be the second sims 3 game and ambitions was after that so that is the second expansion. Sorry if I didn't answer your question. :)
press your coma and period keys on your keyboard to rotate them.
You can buy the nude mod or you can find it in the sims 3 exchange.