The November issue of COPA Flight, the monthly COPA publication, included an article on the steps required to import a flying homebuilt aircraft. I believe their is a document on their website with all that information in it. Probably in the members section but I can't remember. Prior to joining COPA I didn't have high expectations but I have found the montly paper to be quite educational and their online resources very useful as well.
The basic process is you need to bring it in, pay duty, have it inspected by Transport Canada (with some fee of course) and register it. MD-RA doesn't do import inspections for some reason. You'll also have to figure out how to get it here - if you're a Canadian pilot you'll need a license conversion to fly a US registered plane.
