If you're a complete novice, start with pedals or some guitar wiring and do enough to get comfortable before diving into guitar amps. The Build Your Own Clone site has a lot of very nice project pedals with excellent details. They're a little more expensive than some other sites, but I think it's worth it for their directions and forum support for someone new. The downside is that you won't learn much about how they work if you just follow the simple step-by-step directions. There are some excellent sites out there on electronics education now. The education section of All About Circuits is pretty good. It does delve off in EE land with some calculus and complex analsis here and there, but you can learn a lot without getting into it. It has worksheets with solutions on everything. I also really like the tutorials at Electronics Tutorials for a place to go after the All About Circuits site. It doesn't have problems, solutions, etc. but does a nice job of developing introductory concepts in amplifiers, digital electronics, and a number of building block active circuits. I just found Learn About Electronics this summer. What I've vetted, looks good to me. It does a nice job of jumping over into a fair amount of audio concepts, which makes for a nice way to go for people around here. If you start into those and have questions, ask. When you get the basics down and feel comfortable working on low voltage circuits (run with a 9V battery) that can't possibly hurt you, then I'd move onto tube amps. If you dive in, you'll get there pretty quickly.