There is a lot of effort and learning that goes into creating a balanced ration. There are ingredients that if too great a portion will actually inhibit nutrient absorption. You'll need a good vitamin pack (I only recommend Fertrell) and you have to make decisions on how to achieve desired protein levels, given your location, personal beliefs and locally available ingredients. Balancing the amino acid content is also critical to nutrient absorption. You'll also need to add at least some calcium to your feed, but in the proper portion for your flock's needs.
I don't make my own feed and pretty much can't unless I acquire adequate storage facilities and containers, and get sturdy enough equipment to do it. Before my Co-op decided they weren't going to support Non-GMO custom feed blends, I was working on a base mix that I could modify in 50 pound batches to meet specific nutritional needs for specific purposes (i.e, rooster booster 30 days before breeding begins, Breeding formula for hens, etc.). I've spent a lot of time in the books, playing with feed calculators, looking at sample recipes and debating/questioning real animal nutritionists.
If you'd like some sample recipes, PM me and I'll provide them to you.