Hi,
I may suggest a Ohm Tester to test your coils before installing, also to make sure they work.
Ohms is the resistance of the wire your using and usually it depends on what kind of vaper you are.
I suggest using a coil wrapper but, you could also use a plain screw driver, if the coils are too big, you could use a smaller diameter screwdriver. Usually beginning do 6 wraps and sub ohm vapers do complex builds ranging from 4-16 wraps, but it all depends on how much vapor you want.