Anna - if you go to a Mac dealer, they will be able to help you and transfer everything over. It's virtually seamless. As far as your applications go, if you're using PS Elements or Photoshop, if you call Adobe, they will upgrade you for a nominal fee. They will ask you to destroy your PC versions. Both of my kids and my best friend have recently switched to a MAC and are totally loving it and found it pretty easy to pick up - especially my girlfriend - who is NOT computer savvy. But your best bet is to go to a Mac specialist/store and they will walk you all through it.
Of course, I'm pretty biased as I've been a Mac user my whole life and I've never had one crash or one virus. Mac's were the industry standard in the graphics/prepress/printing industry and that's what I've always worked on.