I am new with bitcoin , and i want to start investing in it to start earning gain.
my Q? i dont know how to start and where i should begin my first steps, waiting your ideas

First you must choose any exchange wallet that is trustworthy and that will require much effort because of redundant spread of clone with scamming codes in it.. Its better to have it in legit AppStore in your convenience and my recommendation would be using more of a wallet that is available in your country.. Because Coinbase and much more wallet dont support buy and sell in all country..