Whatever you do, keep the first one as simple as possible. I highly advise using a one-piece fixed bridge/tailpiece that screws directly onto the body. This basically eliminates any neck angle calculations.
If you get a kit, +1 for the Carvin kit. VERY high quality. This was what I built my first one with about 9 years ago. I wouldn't say there was much learning involved, though, because all you're really doing is finishing the wood & screwing it together.
The telecaster I'm currently trying to finish is very similar to a kit, but not quite. I bought all the pieces, then did all the drilling, finishing, and assembly. A LOT more thought went into this than buying a kit, where all teh thinking has been done for you. This has been a lot more satisfying than building the kit was. Honestly, I didn't learn anything from the kit other than wiring.
Another suggestion would be to buy cheap parts for your first one. Seriously - get a cheap body, neck, and all the hardware on eBay. You are going to make mistakes through this learning process. It's much beter to learn on something inexpensive. After that, upgrade to better parts.
Good luck, keep us posted, and memorize Hyssock's book.