If you go to the top of the page, there's a row of tabs. One of them says *Start Here*/ I suggest you start there!In all seriousness, nothing is guaranteed to work. Most people (about 88%) get positive results. 66% regrow to some degree, 22% maintain what they have but don't regain lost hair, and the remaining unlucky 12% don't see any improvement.
Step 1. Go see a hairloss specialist, or failing that a dermatologist or GP (the latter two will probably be less than useless, and know less about hairloss than you do. Ask them to check for miniaturisation.
Step 2. Ask them for a prescription for proscar 5 mg finasteride. Go online and but minoxidil 5%. Cheaper brands are greasier but should work just as well. Buy a tablet cutter.
Step 3. Take 1/4 of a proscar pill every day. Apply minoxidil to balding/thinning areas once to twice a day. I use it once a day at night before bed, it works for me.
Step 4. Keep a photographic record of your progress
Step 5. Hopefully, post back here in the success sub forum in 3-6 months time.