This is more of an opinion, but in my experience, no.
The amount of air and shots you will achieve with it are not worth the price and the struggle to carry all of it. Besides, the range and accuracy aren't to great on those anyway.
You can find the parts on the linked page.
Yes. you may need a neck adapter though.
Roughly $2-300 depending on the condition
If you play professinal paintball and get sponsored then yes. Otherwise there is not a way to make money from paintball.
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.
1897. IMO, worth spending the money to get it lettered by Colt
yes
The Piranha USP. Its only $70. most pistols cost over $200.
The first paintball guns were used to mark cattle. They resembled a pistol.
Which one?
For which pistol??
No. Paintball teams generally don't make enough money for scholarships.