I am not sure if there is a minimum of posts required, but be sure to visit the Redshirt Lounge when it shows up for you (the link will be displayed in the index page, right under this forum).
I can totally recommend it to all new members. It's fun, relaxed, you get to know each other and make friends. And none of the higher ranks can see it so that you needn't worry about being silly or asking something foolish.
And the lounge moderators are always the nicest Mods on the whole board
Here is a list of the ranks and their privileges: http://www.trekbbs.com/faq.php?faq=v...faq_promotions
And if there's something you'd like to know, don't hesitate to ask. We do have the inevitable idiot who'll bully you for asking something "stupid" but the vast majority here are nice and friendly posters.
Once you have 28 posts and have been a member here for 2 weeks, you can send private messages, so that you needn't ask publicly if you're not sure how the question will be received.