[Bungleau]

To respond to your questions...

1. Look for a raptor, hope it's a mommy, and... Seriously, there are a couple of raptors and/or eggs available along the river between Valeia and Ishad N'ha. There's a clearing on the west edge of the river that opens to a small area where you can find a raptor or two. If that doesn't work, they're very plentiful after Brimloch Roon (especially in the area in front of the Shrine).

2. I think Rangers can wear any armor, so you should be fine.

3. You never lose a skill or trait once you've learned it. However, to use fletchery, you must be equipped with a bow. If you later change to a class that can't equip bows, you'll have fletchery but be unable to use it.

4. Once you learn a spell, you can cast it forever. The only thing that can prevent you from casting it is not having enough mana.