Call your local county extension agent. They are affiliated with a state university and every state has them in every county. Their services are free or very low cost and they can recommend seed for your soil type and intended use. If your area is prone to erosion, they may even have resources to help you buy specific types of seed that will both be a good forage and prevent erosion.
In the four states I've used them, they have offered great suggestions on everything farm related from pasture management to fencing to options for water lines to grain storage to improving ventilation in a barn to...
My urban relatives utilize their services, too. Just an amazing resource.
If you have trouble finding a number in the phone book or online, try contacting an area 4-H club, county or state fair office, or FSA (farm service admin.). They should have some type of contact number to start your search.