I have taken over an allotment somewhat late in the season for any organized planting, a lot of it is still to be cleared and I am growing "green manure" as a stopgap to keep the weeds down and condition the soil. You sow it and when it grows up hoe it in.
I am not a scientific gardener nor ever was, my policy is to put a lot of everything in (so long as you know what it is and where it is and, be prepared to lose a lot of it, then concentrate on what comes up best, because that is going to be what the soil is good for.
My back won't take any heavy digging, and my brother has gone on strike so I think I will adopt the minimum cultivation technique, and simply break up the surface of the soil with a swan necked hoe. Seems to be doing alright so far, in that what has been planted in the least cultivated parts is doing better than what is in the properly prepared bed, my brother dug for me. No wonder he is disgusted with me. I could hire a rotovator, but somehow that just does not appeal to me, it seems like cheating, never mind it would just rip randomly through what is there including the plastic that lies beneath the grass, there having grown up an entire level of turf on top of what was previously put down to control weeds.
I have my first crop already of willow withies, from clearing what had got out of hand when the allotment was abandoned.
That which I can't cultivate is laying underneath tarpaulin for now, which I am gradually clearing back. The name of the game is patience and not to expect much in the first year. My plot is about 80 feet by 27.