I think most do RN to BSN then a BSN to MSN/DNP program with a concentration in FNP. Some may do a RN to MSN-FNP program, but I personally don't recommend those unless the actually grant a BSN in the middle where you can change schools or drop out at that point if you need to. I'd figure up costs closely. It's very possible to get your BSN for $10k, and then FNP for $25-30k. If the program you are looking at costs more than that, I'd do more research on your options.