First food plot

Hey Folks- I'm very new to the site as you can see by the # of postings and I am looking for some suggestions on planting foods plots for the upcoming season- I'll try to include as much info as I can.
We have 15 or so acres, all in grass that is mowed throughout the year. The land is bordered by a 40 acres bedding area that is off-limits to hunting on the west and a smaller thick bedding area on the east. We have the equipment to plow, disc and seed ( unfortunately we don't have a corn planter at this time ).
What I am looking for is to plant 3 or 4 acres with a combination that will keep the deer feeding on the property from spring through next winter. Unfortunately with all of the brands of seed blends on the market, it is hard for me to determine which may work best. The property is in Dauphin County. All suggestions on what to plant and when to plant it would be greatly appreciated. Sorry to ramble on- Thanks in advance- Shaef