Well this forum can be a huge help. I've learned a ton from reading things on here, along with doing all my own installs. Some people have a passion for it, others don't. I am one that absolutely does. I can't pay attention to most things for longer than 15 minutes, but I can spend 12 hours on a full install and end the day with bloody hands and a sore back and still love life. One of the few things I've found that I can do forever and never get sick of it.
As for the technical stuff, you pick that up as you go along. Just a few things you mentioned as far as wiring:
WHen you wire something in series, you're essentially doubling the resistance. So if you take 2 4 ohm woofers or 2 4 ohm voice coils (basically the same thing) and wire them in series, you will create an 8 ohm load. When you wire something parallel, you are cutting the resistance in half. So if you take 2 4 ohm voice coils or 2 4 ohm subs, and wire them in parallel, you will end up with a 2 ohm load. When you wire something in series parallel, you're usually dealing with more than 2 subs or more than 2 voice coils. So say you have 2 12" Type Xs for example. They are dual voice coil subs with each voice coil being 4 ohms. So if you wire them in series parallel, you end up with a 4 ohm load. THis basically means you wire each one in series individually then run them together in parallel, and you end up back at 4 ohms. Or, rather than try to remember all this the first time, you can go here: //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp
Plug and play! Gives you every wiring option available based on how many subs you are using and what resistance they are. You'll stumble upon things like that along the way that make things simple and help you learn a lot.