Friends with benefits 101 help

The problem is I’ve had feelings for him in the past, and he had feelings for me in the past. But that was way way in the past and now he’s made it clear to me that this is just a friends with benefits thing he wants and that’s fine, that’s what I want too. It’s just that my feelings are a little all over the place. But I don’t want them to be. I don’t want anymore than fwb and I don’t want to make him think that either. What are some like guidelines to follow and remember to have a successful fwb situation?