Hallo, i'm a beginner bitcoin user 
- Hello Virgiawansss555, welcome on board. You have landed on a right place to learn about Bitcoin and related aspects.
1. As a beginner, what should I do first time?
- Read, Read & Read. If I am not clear, let me repeat loudly READ. There is huge valuable content on this forum which is updated in a real time by the experienced users so spend time in reading it.
2. How can i get BTC?
- It's just a money and you can get/earn/acquire Bitcoins against anything valuable that you have. In most the cases, you can offer your skills and knowledge through useful services. For some ideas, have a look at this useful thread
* 100 Ways To Earn Bitcoin. Credits: Kuriko and thread contributors.
3. Then, how can I make to redeem the BTC?
- You can use any exchange which supports withdrawal in your local currency. You can visit localbitcoins.com and sell your Bitcoins there.
Hope that helps, good luck