It sounds like you are serious.
Lessons are important. I worked on my own for three years which was a mistake. While I made good progress for the first two years the third year was a waste. I then searched for a teacher, the first one I had had a bad attitude and did not like teaching and in my opinion was not very good at it. I did find a good one who is reasonably priced after asking just about everyone I know. I now take a 45 minute lesson every two weeks and I see steady and solid progress. She helps me with the liltte things I would not be able to pick up on my own.
I would also suggest you get hold of the Harvard Dictionay of Music. It was recommended on the forum several years ago and when I first got it I thought it was a waste of money buy I now use it for notation, etc. You can probably get it at your library. http://www.amazon.com/Harvard-Dicti...mp;s=books&qid=1211506044&sr=1-1
Yes, get away from the kid stuff as quick as you can. It has its place but you have to push yourself to move on. Don't be surprised if you end up looking for another teacher in the process. My teacher pushes me very hard, she would not have let me stay in kids material very long.