Do you have to do something agricultural with it? In the short term you could just leave it and enjoy the wonderful waving sea of grasses you will have in the summer, perhaps with some wild flowers
umm - I've done that and believe me you don't get various types of pretty grasses - you get field grasses, of various varieties, but not necessarily pretty, and no wild flowers either
I want my grass long, with tracks mowed through it, so my dogs have somewhere to play and train. But I also want it functional, so although it's only a fifth of an acre, I've planted 8 fruit trees (apples, plums, cherries), some rasps, gooseberries, blackcurrants, and a few perennials, such as geums, heuchera, crocosmia, lady's mantle etc, to break up the green a bit. I also took advice from a wildflower company and grew some wildflowers and rattle from seed to plant out as soon as they were big enough.
So hopefully I will have a wildflower orchard/meadow in a year or two