Firstly I will like to know if there's any particular amount of Post or probably a task required of Newbie daily or weekly? since ranking is considered to be a necessity.
You can post as many as you like but a single quality post is better than many low quality posts or spam.
Bonus:
Make sure you read what people are posting and not just come to this forum posting. This forum should be like a social platform where you will read what people are posting. This coupled with learning will help you to earn merit and rank up.