about 1 to 2 miles
Gosh I love seeing this and hearing your story.
Don't ever lose your sense of ambition. Far too many people (including me quite often) have the "well, I don't have _________, so I can't ___________" mentality.
You've already set your self apart from others by taking the initiative that you have now. Don't ever lose that.
As far as taking on more work than you can handle... The biggie is going to be school in the fall. Not much you can do to replace the block of time that you'll be in school.
I don't mean to muddy up any custody arrangements between your parents' divorce. However, I think that you've already shown such a high-level of maturity this far. I don't think it would be irresponsible for you to ask for more time at Mom/Dad's house, so that you can get more work done. I think any Mom/Dad would be proud to see their son with such a work ethic.
Jake, when you're not working, I would suggest you read two books.
#1 - The art of money getting, by PT Barnum. Start with this one, as it's a short read. The title is tricky, as the book goes on to describe that there really is no "Art" of money-getting, and far more important is the actual discipline of money-saving.
#2 - How to win friends & influence people by Dale Carnegie. A longer book, but chapter-by-chapter, this book is easy to read & very valuable.
I would even offer to send them to you if you'd like. It's not wise for a youngster like you to share your address over the internet - but if there's a nearby church, gas station, or if you simply wanted to hold the package at your local post-office, I'd be happy to send these to you.