From what I know, Rosalina doesn't have many, if any TRUE combos. While that's depressing at first, it also makes you realize that everything you see in tournament by Forte or Dabuz is improv combos. It's based on pure skill, not mechanics.
Rosalina is an open palate.
But next time, before opening up a new thread, read around the board for a bit. There are lots of great players here chocked full of knowledge. We love discussion things, but because each of us knows so much, it's a bit complex when you say "Can someone help me with everything."
I can almost guarantee that all of your questions can be found somewhere on this board
Start with the pinned posts, the ones at the very top of the board. That should give you most of the basics. While much of it may be review for you, it's a great place to pick up terms you may not have heard us use, and to get to know some of the people around here-- as well as catch a few tidbits you may not have figured out.
If something seems confusing or you can't quite do it, that's when you ask. But ask it on that thread. Having your own thread is more of where everyone can gather around to share information. We'd like to keep the board as clean as possible so new people like you, or people who haven't joined yet can find information as quickly as possible =]
If you have any more questions, please PM one of us, we're all friendly people and would love to guide you =D