The Gardener for the township of Scotia showed me his roses started from seed. He planted them in a comercial soiless mix and kept then damp but not soggy in a bright light but no sun window. They actually had flower buds on them before they were large enogh to support the blooms! He said that because of pollination from so many other roses in most areas is likely the plant you grow from seed will more than likely not be the same as the one that grew the hip. Good luck with yours and keep us informed on how you succeed.
I am trying some myself. I found directions on the net somewhere. Basically it goes:
4 months in a damp paper towel in a plastic bag
6 weeks at 70°
then back in the fridge for spring planting
I am trying this method, however I don't see why letting nature take it's course would not work just fine. Simply plant the hips in the ground and see what pops up. I'm not too worried either about what variety I get. I figure free roses are better than none at all. If I don't care for it (long shot) then I'm sure I can find someone who will.