Your case isn't very dire at all, which is great, so the first thing I would say is don't freak out.
As for treatment, the "Big 3" are what most people would recommend:
1. Finasteride, a DHT-inhibiting oral drug
2. Minoxidil, a topical growth stimulator
3. Ketoconazole shampoo, commonly sold as Nizoral, which does not have FDA approval for hair loss treatment but has plenty of anecdotal evidence supporting its efficacy
Taken together, they are the most powerful current regime for treating hair loss. The one thing I would caution you about is being aware of the possible systemic side effects of taking oral Finasteride, which include loss of libido. Generally these side effects are rare and go away after cessation of the drug, but in many cases they persist and can cause serious problems.
IF you do think you want to get on finasteride, do yourself a favor and get a baseline blood test, so that you have something to compare to later on IF side effects do show up.
Best of luck to you sir; you are doing the right thing in catching it early