New to the Entrepreneur life

A little overwhelmed in this world of starting your own business but its something I am passionate about and have the confidence in myself to be successful. What are two crucial pieces of advice you would give to a new person starting their own business? My niche is Women’s body image positivity. I understand about narrowing down your specialty. do you think body image is specific enough, would I be able to help with emotional overeating as well or would that be separate? Thanks!