Posted: 24/01/2013 at 19:08
First thing I would suggest is to divide it into 4 equal sections for crop rotation. I'd then plant spuds in the section which looked like it needed the most attention, digging-wise. Peas, beans and other legumes in #2, cabbage and other brassicas in #3 and carrots, parsnips and other root crops in #4.
Doing all of that is going to be a lot of hard work though, especially on a plot of that size which has not been cultivated for a while, so if they are beginners, start small and consider covering the rest of the area with weed-suppressing membrane for a year, after which it will be much easier to cultivate. See what grows well in the type of soil they have within that first year and what utterly fails (some things will!) It's easy to try doing too much and getting disheartened.