For over twenty years I used minoxidil on it's own. It grew back my hairline when I was twenty years old (a NW2 to NW0) on 2%. A board certified dermatologist prescribed it to me Minoxidil is good at regenerating hair that has recently been lost. When we're young, are bodies can heal better because we get much better REM sleep then when we are older. For my experience, it retarded my baldness. My father was a Norwood 5 at my age.
I think the negativity from minoxidil is because it only works for half of the men who take five percent. However, as far as hormones, it is side effect free.
It will start a shed before the hair grows into overdrive (grows faster/longer). But this is only where you put it on your scalp, and you should see regrowth as soon as you see the shedding. If it doesn't regrow the lost hair right away, after a month, than minoxidil will probably not work for you.
You are smart to investigate your options before trying them out. Since you are young, and your body is generating lots of growth hormones, you will probably be a responder.
Good luck, and please keep us updated.