Which Sims 3 expansion pack should I purchase first?

Hello. I have all the expansion packs except the new one that just came out. Will be getting it though as it looks like it'll be fun. First, you must have the original Sims3 disc - so keep it. Then when you install the expansion games, the last game installed is the disk you use to start the game. It's a "build-on" kind of thing. I love building houses too. I'll make a character or go into a ready made family, then redo the whole house for them. Then I go on to another. Try downloading the free "Create A World" beta. You get it from the Exchange "store". Bare land you make your town/houses the way you want them, then start adding your Sims. No interaction with Sims - just have a ball making houses. TONS of fun. Each expansion kit gives you new options - some give you new things to build with. Otherwise, I go in to the store and buy windows, doors, etc. Hope this helps.Have FUN.