One thing you will find here is that no one will jusge you. And even those who have been around for many years don't know it all, so don't worry.
As you will read here, there are lots of opinions and FREE advice. but be sure and read LOTS of thread as well as do you own research on other websites about food quality for EBD's. What you need to find out is what is the BEST food for YOUR dogs. Some foods are better for some breeds. I have a lab also and beneful works great for her, no probs. But the Bullies get a variety. The puppy gets Royal Canin, two adults get Canidae (grain free, ALS) and another gets bison protein.
So no one brand is best for all, and just becuase it is expensive does not mean that is what you have to buy. Avoid making home made, to avoid inconsistency and certainly the other items in packaged foods are benefical.
See the other posts and threads about skin conditions as well. Some skin conditions are food related, some are environmental (inside and out) and yet even others are genetic, heritic or breed specific. It does take time and there is a lot to do to treat the conditions for making him feel better. Oatmeal shampoos and conditioners are very good, itch/hot spot sprays and lotions and even making sure of the laundry soap you are using is important.
But don't change everything or try everything at once. If it does improve, you will have no way of knowing what exactly works.
Continue to rub the rabbits foot on your hand, his paws (all 4) and way in the air in a circle three times counterclock wise.