I dont understand why would I need SP to post something? I get only limited free posts a day? I still have 1 hour until the first payout of my first post. when i go into the steem FAQ it says "Does it cost anything to post, comment, or vote?

No. It is free to post, comment, and vote on content on steemit.com. You might even get paid for it!"
https://steemit.com/faq.html#Does_it_cost_anything_to_post__comment__or_vote