Builders' Boulevard

Hey, i did get lost here by this link. http://www.thesims3.com/assetDetail.html?assetId=3122615

Can some of you teach me how to make awesome houses and so on? My name is Bull12 on sims3 forums, and like many of you gave maybe seen.. my job really really sucks! I dont know even how to use that palette (or what it is, where u can chooce the item color and so on..). I wanna really know how to use that and i wanna learn to desing and making awesome houses!

Any hints? I really appreacite !!

-Bull12