Bitcointalk is not marketplace, it is forum related to Bitcoin and altcoins. First go through the forum and understand which thread is for what?

Then try to build your reputation by helping others or by sharing knowledge in this forum. Then think about earnings.

Being a newbie your chance of making money are very less. Try to achieve the level of a Member and then think about earning.

Best place to start your journey would be here - https://bitcointalk.org/index.php?board=39.0