I used a Baby Belling from an aunt, and gave it away on Freegle when I'd finished. You can get similar two-ring plus oven electric mini-cookers quite cheaply now, I saw one in Robert Dyas yesterday for £50
Was adequate to cook for up to 8 with simple meals.
We also have a combination microwave which has ovening and grilling ability. That plus a kettle and toaster were plenty but it might have been tricky doing a turkey.
Didn't need to use the slow cooker as the oven was big enough for a casserole but one would be handy if you are cooking much.
You will also need worktop and washing-up space. If you have one or more old kitchen units, they will be handy. The old worktop can be cut down to fit, but should be screwed to the unit to prevent it wobbling or sliding off. you will probably be throwing the old units in the skip when finished so may as well make use of them until the new kitchen is ready. Get at least two large plastic washing up bowls and a big tray that will take a plastic drainer.
Washing up will be more of a grind than cooking. You must have at least a cold tap and somewhere to empty the bowl.
You will appreciate an occasional pub meal or carvery.
Put things away or covered or your plates and mugs will get coated with builders dust. Those plastic storage crates with lids are handy and can be stacked.
A portable radio will be cheering.
You will need good working light such as a desk lamp.
I would be reluctant to use a portable gas stove as I would be worried about fires or gas leakage.