I get most of my stuff for making jigs, inline spinners, and spinnerbaits from Barlow's Tackle Shop. They have good product with good prices.
Luremaking.com as mentioned has lots of plans for baits. Barlow's has the plans for chatter style baits on line as well as info on how to build skirts and how to use wire benders.
Jann's has info on what size blades, clevis, split-rings for what size bait.
I have bought bucktail from Barlow's and I liked it ok. I use mostly living rubber for skirts. It has the best action in my opinion.