Congratulations on your new kitty or kitties!
As far as kitty proofing goes, once you have your kitties home you are going to suddenly discover that lots of things you didn't think were cat toys actually are.
It's hard to say specifically what you should do, because a lot depends on the specific cat and what it gets into. As a general rule, don't keep any plants that are potentially poisonous because many cats like to chew on house plants. Any delicate glassware, crystal, porcelain, etc. should be put somewhere out of reach. Ideally you have a breakfront or some other closed place you can put that stuff. If not, put it somewhere high and relatively stable and hope for the best (there are spots in our apartment we never thought the kitties could get to until we put something up there that they found desirable and, well, they found a way). If you get a kitten or young cat, tuck away your electrical cords and consider getting covers for those you can't tuck away, because some kittens like to chew cords. I'm sure others will be along with other suggestions! Good luck and please share pictures when your newbie is home!