Do i understand you want to plant your pollinators from seed and not from plants? When you say grasses i think of that as your lawn. Correct? You do understand that if seed is applied it may be invasive. Many people do not understand that they can be over whelmed with invasive plants. happened to me once. I do plant annuals and perennials and they act as my pollinators. Let me know your thoughts. With a small area you might want to consider putting in plants that you and the critters can enjoy. Let me know.

OK, you asked for it. I am going to give you some ideas to pursue. I would suggest planning for years, not just one big flower bed. First, consider getting your soil tested. Contact your local extension office at Ohio State. If you do not have one let me know and i can give you addresses of places to test your soil. Next, consider basics for your yard and for the birds and bees. Water, such as bird baths. bowls , something that holds water. Consider a rain barrel to use your rain water for watering. Next, do you have wet areas, dry areas in your yard? Now, onto the plants. You can plant mixtures of plants such as vegetables and flowers. Consider an area out of site for a small compost pile. Its fun and you get great soil from it over the years. I do, like 7-14 wheel barrows a year. Then , how do you want to water the plants? Drip irrigation, over head sprinkler, or none of the above. Items to think about. In the sunny areas i would consider sun loving native perennials such as sunflowers, coneflowers, black eyed susans etc. With these plants do not cut down in the fall. Birds love the seeds. other plants to consider is columbine, cardinal flower, bee balm, one of my favorites for hummingbirds and butterflies and bees. If you have more room, daylilies are nice. I love them and they attract everything. In shady areas i love hostas, and they have nice blooms that attract bees and little toads and hummers. You can also plant annuals like zinnias, salvia, alyssum , herbs for your dinner, They have flowers on them.
See how much fun you can have with this? Don't get discouraged. Buy a book or go to you library or get on the net. Lots of ideas. Sit down with paper and plan where the shade is and the sun. Small area? Start slow, , some perennials and some annuals. Look in you area for plant sales and give aways. We have many every week in our area. You don't have to spend a lot of money to get started. Keep a diary.
I have been doing this for over 50 years and i still get excited about plants and new beds etc. Your getting started and hopefully it will be an adventure that last your life time. I will keep this site open if you want to ask more questions or if you want ideas from other master gardeners. BYe