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.
I agree with you, before I say welcome to bitcoin. if my experience, I will pursue the rating first to raise it after the rating is parallel we join the signature campaign and other projects to get the coffers we want.