I have a post with video explaining the details on how to benefit from steem bounty. The post covers both the side of the author and the reader. I included the reader because mot posts cover for the author only. Check it out here:

Inspiring good quality engagements with Steem Bounty

One thing that I would like to highlight which is not on most posts is that when you do not upvote any comment on your post that has a bounty, the bounty less 10% will be returned to you after your post payout. This is also mentioned on my post.