You must front up at a branch with lease (or certificate of residency), passport and a Thai person (preferably one who has an account at the same branch). Take the handout from immigration which states you must have xyz baht in a Thai bank account as your reason for opening an account.
Depends if the other province files a TM30 in your name. I try now whenever I'm travelling around the country to keep my passport hidden, and to use my lady's ID when checking into a hotel. This way immigration are none the wiser
I agree with Steve, I think your last 90-day report will suffice, as you're on a long term visa and there's been no reason for you to submit another in the meantime
I used this one until I had the common sense to start the 65k/month transfer method. Didn't sit easy with me tying up 800,000 baht for the rest of my life