Need help from IG marketers to start IG marketing?

hey guys,i have tried different things to earn money from online but i did not get successful.Now i want to start from Instagram marketing.I can't invest any money and i want to do it for free.I came to know that there some people who are doing great in IG.I want to give a try.But don't know from where to start.
IF anyone can help me on this to get started then that would be great and life changing for me.I want someone who can at least give me a guide to start Internet marketing.
THANK YOU FOR YOUR TIME