The best thing that you can do to prevent germs is to make sure that EVERYONE who is around you or your family is WASHING THEIR HANDS!! Wash yours freqently, before you touch her, and don’t let anyone near her who hasn’t washed theirs. If they have any signs of sickness make sure they stay well away from baby and your family, so you don’t contract something that could spread to her. As far as cleaning the house, just keep all the linens/toys/clothes laundered and wipe down hard surfaces with Clorox wipes to kill the bugs.
You can go out and buy an antimicrobial wash called Hibiclens. (You can use it for your hands, or in the shower) Its sold at walgreens, and I’d think walmart might carry it as well. But it’ll be in the first aid section. Its used to kill 99.99% of all micro organisms and germs. Its just an extra step you can do if your really freaked out and want to make sure you dont have any germs on you when you hold her.