Hello Quackaz - a big fat warm welcome to Purrs to you and Caspar
Oooo am not surprised you're excited. I think we all would be too - in fact I know we would.
First of all, I think your choice of kitten is probably a very smart move, as Maine Coons are generally very loving and affectionate, laid back cats with a reputation for getting along. Not to over-generalize of course - you can get cranky Maine Coons just as you can any other cat.
You need to make sure that you can give Casper a safe place, or series of safe places, which are hers, and hers alone, but initially, most of us would suggest keeping the kitten in a room of its own to begin with.
This link has some really useful information, which we've followed before with good success:
http://www.wayofcats.com/blog/adding-catsI've gotta dash - shouldn't be looking on the forum right now
but hope this will be helpful.