Welcome Digger. Very sensible not to start off with too big a veggie plot. I agree with Morri2 that it's best to skim off the turf - by hand or hire a machine if you want to save your back for later. Stack the turf upside down to make a fertile base for potting compost in a year. Again you can hire a rotovator by the day or by the week from a tool hire company to work the soil. If you intend to use a no-dig method in your veg garden this might be a good idea. If though you want to grow rowcrops then having a rotovator of your own is a good idea. We have 3 - one goes behind a tractor (Siromer), one big one you walk behind (that's a joke - you wrestle with it) - bought from our local agricultural store as you then get back-up and it's stronger than some 'garden' types, and a Mantis for between the rows and inside the polytunnel. They all have their place but we didn't start with all three, but got them in descending order of size over several years, as our needs changed. We started by ploughing then rotovating. Now some areas we still rotovate each spring, but some 'beds' we keep covered over a winter then use for root crops the following year. We don't have raised beds - here veg grow perfectly well in flat ground, but it does depend on your soil. On old pastureland, expect cutworms, or whatever daddylonglegs babies are called.
For hen coops, we use B&Q 10% off day garden sheds - cheap, hold lots of hens in comfort, you can stand upright to clean them out and they only need the addition of a pophole, perch, a couple of double nest boxes and possibly a different floor covering - and there you are. We have three for less than the price of a small 'lifestyler' coop.