Hi Peter, welcome to Mayhem, your question about paint is not to early, knowing where to get your supplies means you can order as funds are available. Depending were you live, 2 possibilities, use Halfords, they will match paint and produce rattle cans for you, also if you have an auto paint supplier in your area they will mix paint for you, its also a lot cheaper than Halfords, filler and sanding papers are also available in bulk, its the stuff the pros use.
Ask your questions we love to help but we love photos of progress even more
Mark