Choose a neighborhood, once that's done, then click on the bottom on the bottom left of your screen that says "Create a Sim" (it's pretty huge, hard to miss). Create however many sims you want, and choose a household for them to play in. There are some cheats that allow your sims to have over 1000000 simoleons (money). However, if you don't have the cheat you might not be able to get them into the house you want. Once you've moved them into a new home, you can go into buy mode and put some decorations or move things or delete things that you don't like in the house.
it's so much fun! You can create your own chaceters and how you want them to look. then you can buy your own house if yo u have PS3 click save then hit the bottom ones then go to build and buy and click on the lama you can get the jackpot! You can also get expansions packs only if you have a computer though. You can have kids get married watch you sims age and kids grow up choose between different jobs and what your sim is going to do where they're going go. Pretty much everything you can think of!
You can play Sims 3 by first purchasing the game and then creating your own Sims. Next, buy/build a house on an empty building or piece of property and then furnish your house by pressing the table and chair button. Make sure that you find jobs for your Sims or check out their wishes. Check out http://www.carls-sims-3-guide.com/how-to-play.php for details.