Now what should i do as a newbie and howto get bitcoin BTC ?
Welcome to the bitcoin, you can start with buying the bitcoin now if you have funds, if you're not have it i suggest you can go with join the airdrop / bounty but with your rank now it's hard to join them. But just patience for 1 month to reach jr.member rank then you can join with them.
As a newbie, many get their coins through free means like faucets and airdrops; however, the amount you can actually get is not as much as before. Another means you can get bitcoin is through ICOs, you can join campaigns and projects where you can be awarded with coins upon doing some tasks. The more advanced one is through trading and investing.