If you're talking about embroidery thread, don't buy a bunch of thread ahead of time because different machines have different likes and dislikes regarding thread. What someone else's machine just loves, your new baby may hate. So just buy some small spools until you figure out what your machine likes when it comes to embroidery. I have two brother machines and they aren't too picky. I have used ARC, Brother's thread, Madeira, and my personal favorite, Admelody.
Good luck with her when you get her home. Have lots of fun.