17 with early balding, where do I start?

I’m currently only 17 and I noticed recently that my hairline is starting to go. It’s not so noticeable at the moment, but does bother me a bit. I’ll drop some pictures so you can get an idea. I have no idea what to do right now and I want to stop it and regrow to make it thicker in the areas in a bit thin. I currently only take a multivitamin everyday since that’s all I feel safe taking until I get some solid advice. I know about a derma roller, finasteride, and minoxidil but I’m not sure what I need to take. Please let me know!

First I would advise you to find a good caring doctor who will build a Master Plan with you to allow you to maintain your hair for many years.  Getting a HAIRCHECK test is a good thing because it will quantify the amount of hair you have lost so far.  Things like the Dermaroller with minoxidil works well. So does finasteride but make sure that you really have hair loss and are at the beginning stages of hair loss before you commit to these treatments which have to be maintained.