Needing help and advice.

Hi, I’m very grateful for any help I could possibly receive. I’m a 19 year old about to turn 20. I come from a very poor economic environment so any money I’ve earned I’ve worked hard for. Obviously the dream, as is the same for many, is wanting to start and find a way to create a successful business. I don’t have the aim to become overly wealthy but enough so that I can move myself forward in life and be able to cover all incoming expenses. I’m heavily considering getting into selling via Amazon as a start. Can anyone give me basic pointers? Where to start? What products to look for? Where to find how in demand these products are? And anything else people believe would be necessary basic key things to know and understand. I’d be starting with very little money unfortunately but, I understand this learning curve will not be easy. In no way am I underestimating the difficulty of this, I believe it’s a hard thing to get into and takes a lot of perseverance which I’m prepared to put in. Thank you.