Here are my $0.02... If you're not planning on applying until next fall, I would take this time to focus on your premed courses and, after the first of the year, to study for your MCAT. If you haven't finished your physics and organic chem, it's going to be hard to teach yourself the info you need for the test, but I'd make certain that you're familiar with the format and the questions... Take a lot of practice tests!!!
As to the letters of recommendation, I think it's probably a good idea to start making contacts now, but it's a bit premature to be asking about letters of recommendation. The key to the whole thing is to get your AACOMAS in as early as possible. Since you won't be taking your MCAT until August, you won't get secondaries until later in the application cycle. If you can manage it, I'd take the MCAT in April. If you're certain about August, I wouldn't really mention a LOR to your mentors until you get closer to needing them. The timeschedule that I'd suggest is something like this (if you're certain that you must take the MCAT in August):
NOW:
1. Spend time with a DO!!!!! (this is a must!!)
2. Start looking at the schools and making some decisions about which ones you like and why.
SPRING:
1. Complete your AACOMAS application and file it as soon as possible. This includes transcripts from your school(s). This insures that your app is dependent solely upon your Aug. MCAT coming in.
2. STUDY FOR MCAT!!!!!
3. Before school gets out, mention to your professors that you'll be applying to med school in the fall. Ask about their willingness to write you a GOOD recommendation.
AUGUST:
1. Take your MCAT.
2. When school starts back, touch bases with your professors and docs whom you should have talked to about recs by now. Remind them about your application and tell them that you'll be getting secondaries (hopefully) toward late October. When these secondaries come in, get the forms to these people ASAP.
This is all a drawn out way to say, you need to plan for your recommendations, but not really to do anything about the letters themselves right now. Cultivate relationships with the people you would like letters from, but don't request them yet. You won't need the letters until you get to the secondary apps.
I hope this helps!
Take care,
John