Question
what is the best way to grow rose hips?

Answer
There is a really good and detailed web site that will take you through the whole process of growing roses from seeds. Just keep in mind that most of the seeds will produce single pink species type roses and only a few may be different but they will not be the same as the rose bush you got them from. Hope this helps.
http://www.scvrs.homestead.com/HybridizeKB1.html