Welcome to the forum,
A kit, don't know that I've seen one, however you have a lot of options. for $14.00 you can get a pair of Leadmaster pliers, designed for twisting wire loops. you can get a jig like a twist tech or a boggs. that will run you between $60.00 & $90.00. The supply of body parts and blades can be had from endless sources.
When making spinners it all boils down to making the perfect loop. Either by hand or jig it just takes practice. Start off with the pliers because if you advance in spinner fab you'll need at least two sets anyways.
If you search the archives you'll find a ton of info regarding how to build spinners as well as a bunch of theories too, lots of good information here.