What could be a good feed formula for broilers?

Hi Margaux,
As i am new to this industry as i was planning to start Poultry Feed Mill related to Broiler and Layer Feed Mill can you please help me with your inputs what all things need to take care for good Feed Formula for Broiler - Pre-Starter, Starter and Finisher and in case of Layer Feed - pre-starter, starter, grower, pre-Layer, Layer feed formulas as i will be looking forward for your help.