Well you still seem to know lots now hah. I'm having trouble getting from my level of knowledge to the next, mainly looking into learning more about speakers and enclosures, any books or sources you could share?
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Experience...
This site helped me a while back, but there is no way to learn about car audio anymore because there is no more of that on this website (read the poast above me). And no, I don't care that this is The Dome. Any audio related material we can get on this site is good.
Save up some money and start patrolling craigslist for good deals. Find that one item that you can make AT LEAST double the profit off of. You will start off slow, and end up finding 2-3 good deals a week. Only buy equipment with the money you make from selling them. By doing this, and trying new things, you will learn more. You will also get ahold of better equipment than you could have dreamed of getting.
All of my equipment...every last amp, speaker, all my home audio equipment...It was all bought with the money I made through sales profits from craigslist. This includes my Atomic APX-18, Infinity RS 2.5's, both pairs of Technics SB-7000a's, my PPI A1200, etc. I noted every item that I could see myself selling about a month ago (only the stuff that I would want to sell, which is about half of what I own lol), found the average market value for selling them all, and the total was about $3500...Again, that's half of my equipment, all of which I acquired through money made off craigslist deals.
In the end, it's a win-win situation. If you get bored, try something new like repairing amps. I'm currently in the process of stripping an amp of every single component on the board...I'm 10 hours into it and about 75% done lol. There is still so much to learn...