Welcome to Steemit! I just joined two weeks ago but I'm enjoying it tons. A lot of friendly people are on here.
As a word of caution: you may earn quite a bit from your intro post but afterwards it's going to be slim pickings. Don't be discouraged. Just keep on posting and comment on others' work. If you provide meaningful comments, there is a good chance they will follow you and followers mean your blogposts get seen and upvoted more. Just keep working hard and you'll keep advancing!
Besides getting more followers, commenting is also a way to earn. So head out to the "new" section and comment!
If you didn't leave yet here is another tip: when you post a blog post, comment with @OriginalWorks and the original works bot will check originality and upvote.

Good luck!