Wow Pananep I'm sorry no one has contributed to your questions. Unfortunately most of my tries are failures, maybe just sharing will help bump this topic up coz I'm also interested in the topic.
1. Potting mix, a friend of mine says that cocopeat is his choice. Shawn made experiments on potting mix, and if I remember correctly Peat moss produced the last and least germination, I think LFS (sphagnum moss) was the best, if I remember correctly.
2. I have used Sphagnum moss and Cocopeat, unfortunately without any sucess. Bad luck or bad germination skills on my part. Droseras are easier of course.
3. I have not been able to germinate so I can't yet imagine how hard or easy it is to take care of the seedlings, but I heard you need to take care of them daily, make sure they are moist, that is why a humidity dome is a good idea.... problem for me is that humidity dome will surely make fungus grow on the potting mix suface and suffocate the seedling.
This is my experience with Drosera seedlings as well so I assume I'd have the same problems with Nepenthes.
Hope others chime in with their comments and suggestions
TTFN
Arvin