check polaroid's website they give specific directions, and/or find a copy of Kathleen Carr's wonderful book "Polaroid Transfers". It covers anything you will need to know and more.
daylabs or vivator processors can be found on ebay on a regular basis. You could also find a polaroid camera that will use 669 film and by pass the slides; however, it has it's own drawbacks.
Check Kathleen's book, it is very detailed and will be easier to understand.