An orchard area would be a good idea. You could have a nice little collection of trees that could keep you in top fruit. I would also consider building a fruit cage and planting a load of soft fruit. A clump of rhubarb, a row or two of raspberries and a strawberry bed would also be high on my list.
Asparagus are a great crop, but they do need a lot of soil preparation. Establishing a decent bed would pay dividends in years to come. Other perennial veg to consider would be globe artichokes and seakale, which are also delicacies
Chickens are great fun, but will destroy everything you plant, so they will need an enclosed coop and run somewhere on the plot. As they are on a plot, rather than at home, make sure it is really secure and consider an automatic pop hole opener and closed, to make sure they are safe at night.
Other annual veg that fill space quickly with little faff are squash, courgettes and pumpkins as mumofstig says, potatoes, big leafy greens like perpetual spinach and chard, cabbage and purple sprouting broccoli, peas and beans, sweetcorn, outdoor cucumber and bush tomatoes.
Potatoes would be the first in and you would need to be quick to grab some seed spuds now, but you could start sowing the rest bit by bit, depending on what facilities you have for this. If you haven't got a greenhouse at home, a plastic covered growhouse and a cold frame would be be useful. Some of these will need netting against butterflies and birds (basically all the brassicas and the peas) but again, you have time to sort this out