If you're a senior, you seriously procrastinated way too much on these things. If you're not, then you have until practically next November (11/2013) to take the tests. Anyway, to answer your questions:
1 and 2: Do what you're most comfortable doing. The order does not matter. The exception is if you're a senior who hasn't even taken the SAT I once yet. If you are, then take the SAT I first and worry about the rest later. Otherwise, do what works in your life and you'll receive better results.
3. Math II because of a kinder curve and more impressiveness.