1) Yes
2) Get the ECU that comes with your new motor
3) Yes
3a) order from
www.hondamotorsonline.com and you will get everything you need, or go to a junkyard and find a wrecked integra and pull the motor out of it.
4) have a professional do the auto to 5spd swap, it shouldnt cost more than $500. It will cost you less in labor to do both swaps @ the same time.