Here's a general tip: You'll want to make a post in the #introduceyourself tag. Basically just introduce yourself, maybe include some info about who you are, what you are into. Throw some pics in there, maybe even one of you holding a piece of paper with your steemit screen name and the date. That's a verification picture. Of course it's not required, but many people do it, so that when people are upvoting your posts, they feel assured that you are a real person, not some fake account.

You can go to the search function at the top, type in introduceyourself, and then click on the hot or trending posts for that tag. Other's posts may give you a good idea on how you'd like to do your own.

The other question is when should you do that? You could do it now, or you could also wait until you build your following a little. The more you upvote, comment, re-steem others posts, and post your own content, the more followers you'll gain, hence the more people that may see your official #introduceyourself post.

Anyways, hope this helps some.