Dye paintball makes one of the smoothest and high quality marker, while planet eclipse makes the fastest marker so it depends if you want speed or smoothness. There are several other brands that make high end gun, but when you get to that quality of marker, valve preference and ergonomics is up to you.
The best brand of paintballs are Marballizers.
No, they are separate.
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.
DLX, the makers of the LUXE.
Brass Eagle, anything from walmart, and spyders,
Canadian Tire has the best deal on paintball gun packages. One can also get best deal from paintball online store. Amazon has Tippmann 98 package for $154.
Paintball grenades are a great outdoor sports option. The most highly regarded paintball grenade brand would be Empire. Another good brand is Tippmann.
eBay is the best way to sell
The purpose of a paintball gun is to fire paintball pellets, to mark opponents in the game of paintball.
Nitro duck is a good brand, but tippmann is better in my opinion.
Tippmann is the best brand too get. Spyder is another good brand that isn't as good of a gun but Tippmann's are a bit more expensive but there is really no difficulty with Tippmanns at all. Invert mini is the most expensive gun around these days ( 500$ ) or the Bob Long guns.
A paintball marker is a paintball gun. It is just called a marker instead of a gun.