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

Investing? Are you planning on investing in bitcoin (ie. buying bitcoin0 or investing on platforms? If you are planning to buy bitcoin, first of all, where's your area? You can buy bitcoins on different exchangers depending on which is available in your country. You can check localbitcoins , coinbase or a bitcoin atm near you.
If you are planning on investing your money on platforms like hyips, doublers, gambling bankrolls, make sure that you understand that these kinds of investments is risky.