The dp/flex rule allows much more than many coaches realize. It can be a bit confusing and complicated, but if you take some time to at least get familiar with some of the uses, the ones that can help your team the most, it will give you options you never knew you had.
One document that came in handy for me was the dp/flex strategies printout available at nfhs.org (DOWNLOAD HERE). Like I said, at first it was a bit confusing, but actually writing out a lineup with names of players on your team may help you grasp the concepts and dp/flex strategies being shared. You may not understand all the different possible uses, but just choose one or two that you feel will help your team most and get familiar with how to implement the strategy and use it in a game situation.
Then…give it a shot in a real game or scrimmage and let me know how it goes!!!