I'm not sure if this is the correct forum, it seemed to match

.
Anywho, I recently learned that a friend of mine plays Magic. This friend doesn't play
40k, and I sometimes think feels a little left out when I talk about that grim-dark masterpiece. So, I'm thinking I might start up a cheap, casual Magic deck. I'm liking the look (both art and play wise of the blue deck. Before I take the plunge, I have a couple of questions:
[list]1. Aside from a Tenth Edition Blue started deck, is there anything major I'll need?
2. How often does WotC rotate out cards? Back when I played Dark Ages of Mechwarrior, I was rather annoyed when two of my favorite units were removed from legal use.
3. Are the colors desgned for "rock-scissors-paper gameplay"? If I take blue, will a black deck have an inherent bonus against me, for example.
Thanks in advance for any help.