Hi Revenue
I've never used Name Park It! but I believe the part of about needing a homepage means if you want to redirect that name you just registered to your main SBI! site, you must have your homepage launched otherwise it won't show anything when someone types in that name you just registered.
But if you are just registering names just to keep other people from taking them then you don't have to worry about having your homepage ready. They'll just sit out in cyberspace until you're ready to use them. You don't have to setup a redirect on these names you're registering if you don't want to. Some people just buy them to keep others from taking their ideas, names, etc. So sounds like you're fine.