Who and How do I ask someone to script a turret or something for me?

So I need to make a turret that when a player pressed the button it will shoot a boat, the turret would have max ammo and a certain amount of ammo.
The thing is… who and how do I ask someone to script a turret for me?

You could head over to #collaboration:portfolios and hire someone to do it. There are plenty of developers who are willing. Just beware of people with no reviews/people to vouch for them. Find someone trustworthy.

how much robux does some of them cost?

They usually put their prices on their portfolio’s, or you can DM them for their estimate.