No. Viewloader is notorious for low quality products that have many malfunctions along with being generally bad in every category but price.
You can find the parts on the linked page.
Nitro duck is a good brand, but tippmann is better in my opinion.
its a good starter gun
No, they are separate.
DLX, the makers of the LUXE.
When someone is just doing paintball for the first time they need a paintball gun that is easy to use and light. The recommended one is a Tippman 98. Any of the variants will be good.
No. They are not really paintball gun, but toys.
Brass Eagle, anything from walmart, and spyders,
No, Brass Eagle is one of the worst paintball brands known. It has an unprecedented record for building the least reliable and cheapest markers available.
As long as you get a good gun, it does not matter where you buy it.
NO!unless you are just getting into paintball.