Here are links to several companies that can provide you with rod building materials and kits
SaraBella Fishing Company https://www.sarabellafishing.com/
Hook and Hackle http://www.hookhack.com/html/rodbuldingkits.html
Mud Hole https://www.mudhole.com/
Custom Fly Rod Crafters http://www.flyrodcrafters.com/
Proof Fly Fishing https://www.proofflyfishing.com/
Anglers Workshop http://www.anglersworkshop.com/
You will need
A blank
A guide set to match your blank (use the rule of thumb of 1 guide per foot plus 1, this includes your Stripping Guide but NOT your Tip Top)
A tiptop to match your blank
A grip (the cork)
A reel seat
A Hook Keeper
Thread
5 minute epoxy
Finish or thread epoxy
A rod sock
A rod tube