gonna try building my first set of wheels soon and i had a couple questions regarding spoke lengths, gauges, nipples and ****.

what length and gauge spoke should i use for a radially laced front wheel? Does the same length work for a 3x rear wheel?

Whats the difference between having a single butted, double butted and triple butted?

cheap places to buy black spokes and nipples?

im gonna be building these wheels with a velocity/IRO fusion rim and probably formula hubs if this has anything to do with it.

THANKS YO