Good plots are fun and can be rewarding. They can also be a lot of work and expense. Sounds like you have a sweet setup though, so let’s think about it. That time of year your primary options,in my mind, are cereal grains. Rye, wheat, and oats. Cheap enough and easy to get started but for this exercise it’s basically grass. Brassicas may work at that time of year if you have a good extended forecast with mild temps and a little rain.
You mentioned a section of pasture so before you disturb it, identify what’s there now. You might already have some clover, for example. Unless it’s pure fescue you might get more benefit from selective herbicide/lime/ fertilizer. That can release existing forms and limits soil disturbance
On that subject, go ahead and get a soil test now. That service is free or cheap through the county extension office. And it will provide a wealth of information on your soil properties and what your soils be lacking in terms of nutrients in pH.
You might also achieve many of your post season goals with mineral sites. Regardless you have a lot of options so have fun with it.