24 year old and I have a baby face

Hey boys, I’ve been wanting a beard and I heard that minoxidil is the product to go for. I have a full goatee, a mustache, and some neck hair with only a very small amount of cheek hairs. I want to know if I should try minoxidil because I have heard that if you stop using it your beard will fall off. Is this true? I’m asking because I know that I wouldn’t like to have to consistently use a product for the rest of my life, or my beard will fall off. Also, how do you guys feel about derma rollers.