APPLE..... APPLE ANYONE?

My computer, Windows based like so many people have, is dying a slow and painful death, and I'm seriously thinking of going MAC with my next purchase.

But I have SO MUCH krap on my laptop that I don't want to lose, so I'm looking for info about Apple machines.  Specifically....

• What happens to everything on this machine that's DOS-based, like my Word documents, my Excel spreadsheets, etc.
• Will all my pictures transfer?
• Same for all my music?
• Can I still get to Blogger to do my blogs?  (I'm assuming that's a YES)
• What's the story on viruses?  Do I need my current virus protection software (which has two more years to run)
• I use Carbonite for my back-up.... will that work on a Mac?

What do I need to know before I switch?  I'm NOT a techie so I don't even have sense enough to ask the right questions.

Anyone with answers, please give me a yell..... and please - share any additional info that I was too dumb to ask about!

THANKS IN ADVANCE!