Eloping

I am getting married in November.....eloping in Orlando! I don`t know what to do about a couple things though......Do people send out engagement announcements and then marriage announcements.... Or just the latter?? I hear it`s ok to still be registered.....where do you write that?? ...what if you`re going to have a party sometime later but not sure when??? Can someone stop me from spazing and ranting?!!