Reddit reviews The DCC Guide: How to Select and Use Your Command Control System
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My condolences - I, too, caught the bug about 6 months ago. :)
Joining flex track is really easy. Simply slide the joiners onto each piece and solder them from the bottom or outside. You might have to remove a few ties and replace them after you're done wiring your power drops.
DCC power requirements are a bit more complex and wholly depend on what scale you're using. These two books were key to helping my understanding.
If it helps to know, my N scale 12x8 layout runs very well on the 2amp NCE PowerCab starter set. In short, it depends on how many locos you want to run simultaneously. I've run 5 locos at once with no problems.
Here's a table from the DCC Guide that really cemented it for me: http://i.imgur.com/JPzkkJq.jpg