Cosplay Suggestions? Questions~

OWO This is probably my first homemade cosplay so I really want tips for my next go at the concept. So here are questions :I 

1. How do you stop longer hair from showing out of a mask without a bald cap? (because I have this problem A LOT)
2. How do you glue felt so cleanly? Mine always turns out messy and there are some bald spots where the base can show
3. How do you do a one piece for the torso and legs? I mean like kinda a onesie, but with a lower crotch, I needed this for my freddy cosplay o.0
4. What brands do you prefer for cosplay? I just use the really cheap brands (hahaha)
5. Who should I cosplay as next con or ya know... Halloween? I'm just an apprentice cosplayer
6. Where do you mostly shop at? I shop at Michael's 
7. How do you prevent hot glue burns? Seriously I have like 20 of them from my first day of hot gluing.