I am considering putting my kitchen waste (peelings + eggshells) into a
trench where I am going to grow peas this year (garden and mange tout). I
haven't done this before so a few questions:

How successful is this method of composting - will it be nicely composted
for the crop that I put in the year after (which won't be peas as I
rotate crops).

How good is it for the peas?

How exactly should the trench be done - I guess it would be about 12
inches deep and then say three inches of soil on top of that where I sow
the seeds?

Can the same method be successfuly used for other veg? In particular
(because I also plan to grow these this year too), marrow, courgette,
squash and cucumber.

Thanks,

PT