are you going to be using NATS or another affiliate software system?

I can tell you with NATS, its really easy, you just build your gallery as normal, then replace all links to your website with the NATS-generated link (in Ad Tools Admin, chose Hosted AdTools and any site and NATS will automatically create the links for you) then save it as a php file. Finally, enter the URL into Ad Tools Admin and it will automatically generate the proper URL for all your affiliates.