On a fishing trip still so don't have a lot of time but had a few minutes while at the motel to reply. Building a rod is not overly complicated, but I also have to say there is a difference between just building a rod, and building something very nice that others will be impressed by. So saying its very simple IMO is like saying doing art/painting is simple because its just daping a brush in paint and putting it on a canvas, that's easy right?
I have taught a friend or two to build a rod in a matter of a day or two and had them building their own rod rather quickly, so the "basics" can be taught easily, but it takes a lot of practice/exp to learn the details like clear bubble free wraps, smooth not footballed finish, crisp edge lines, doing your own grips, burnishing wraps and making sure there are no gaps, etc etc. It's the same as saying fly tying is easy and can be taught quickly, yet we all know it takes time to put the work in to do things like married wings and proper hackle and such.
So with that said, start by watching youtube vids on wrapping guides. After you feel you can try that then buy some two part rod finish, some rod build thread, some mixing cups & brushes, and make a homemade wrapper with v blocks (can look up the cardboard method of wrapper to get started cheap just to see if you like it) and then take an old rod or arrow shaft and practice wrapping and finishing.