A tractor and your own equipment is ideal. However, if you're like me and a tractor just doesn't work, you might consider a few options.

First, get a good chain drag like https://www.ruralking.com/tarter-atv...RoC-zgQAvD_BwE. On a bare plot that's received a good rain in the last 2-3 days, it'll rough up soil well enough for clover and other small seeds. Turn it over to smooth soil and make a decent seed bed. This is all I had for a few years and found it worked ok for clover. It won't be enough for seeds needing deeper planting like grain.

An ATV disc harrow is a huge improvement over chain drag. Four of us went in together and bought this:https://www.ruralking.com/king-kutte...RoC0RwQAvD_BwE. Again, plot should be moist and free of live or dead vegetation. We found the disc alone would only cut 2-3" so we welded a steel tray to frame and added cinder blocks. We now get 3-4" deep. It does put quite a strain on tow vehicle and I wouldn't use anything under 600 cc's to pull.

Lastly, try to find someone who'll come to your plots and disc them with their equipment. I advertised on Craigslist, stating what I needed and the land to be plowed. Found a great guy who charges me $60 an hour and does a good job. Takes him about 2-3 hours but it's money well spent.