As others have stated, just keep posting good content. Pictures help with the posts.

Vote on other people's posts, and comment on some as well. You don't have a lot of "power" to do a lot for a bit, but keep at it and you will soon be able to vote and comment and post all you want.

I think the most important thing is to have fun. If you are not enjoying doing something it becomes like work and can be easily discarded.