The only urgent task is to plant your radish seedlings.  A single row will accommodate a dozen 'plugs' or modules.  I would move aside the inch or so of surface muck in the narrow row and plant in the soil below; the muck will level out of its own accord. Cover with fleece when planted. Have a look at the ones already planted on plot 3.

The beds at 120cm wide are designed so that you can access all parts from the paths so no need to stand on the beds.

It is a good idea to hoe weekly, even if no weeds are visible; they then can't creep up on you!  Grass seedlings at your mini plot edge are the biggest problem as grass reroots easily; get the grasses out with their roots and shake off the soil. Other hoed weeds should dry and die if left on the surface. Any weeds can go in the black bucket near mini-plot 6.

Monty Don has a short video on hoeing ...

https://www.gardenersworld.com/how-to/maintain-the-garden/how-to-hoe-effectively/

There is no rush to plant onion sets, late March or early April would do if the weather or ground is too wet, but here is a useful video ... https://www.youtube.com/watch?v=ckhJv5yWOFk
We are planting in the open ground rather than in holes in fabric.  Allow about 30cm between your radish and the first row of sets.  The small sets are in a bag in the plastic seed box in our polytunnel; take up to a sixth of them but we don't have to plant them all;  some may have deteriorated in store. As for radish and other plugs I would move the inch or so of surface muck in the row and plant in the soil below; the muck will level out of its own accord. Cover with fleece when planted.  There are three wooden battens in the shed for use as measuring sticks.

It's always a treat to see your seeds germinating but be patient!  The first peas and broad beans usually take a week or more.  I am afraid I am inclined to poke the soil to see if anything is almost emerging - better not to! We won't be planting out last week's sowing for several weeks.

Seeds and seedlings need checking, preferably daily, for watering (we need a rota). It was over 30C in the polytunnel during a sunny day in the week.

The lettuce and cabbage sown last week will soon need pricking out into modules.  I will do another post on this, ready for Lesson 3 at the end of March.