To replace a spoke you're going to need a spoke wrench of the correct size, a nipple driver or flathead screwdriver, a ruler to measure the correct spoke length, as well as some lube to put inside...
A vital step in bicycle wheel building is prepping the spokes with some kind of spoke prep.
There are two reasons to prep spokes:
In this series we give you the basics of building a 36 spoke wheel. We begin with lacing the wheel, then show you the process of truing the wheel. So get everything together and make some time...