In that case you'll need some kind of cooking system - we have an old-fashioned meths stove with a very battered set in tin saucepans that all fit together into a little bundle - ideal for two people travelling abroad in hot weather but not great for a family in the UK, potentially getting rained on! I'm afraid I can't really advise on other types of cooking equipment but I'm sure someone else will be along to do so. (I'd a imagine a two-ring gas burner would be your best bet.)
If you're driving then I always think it's worth filling up the car with really comfy bedding - we use the self-inflating camping mats that roll-up small, then take an old duvet or two to lie on (groundsheet underneath prob essential in the UK). We have a double, sleeping bag but take plenty of pillows and extra blankets if we're in the car.
You'll probably want folding chairs and ideally a folding table - to my mind the separate camping-type chairs and a folding table are more versatile than an all-in-one table and bench set thing.
Kitchen-wise I'd take a few Tupperware tubs as well as loads of ziplock bags, a chopping board, a couple of knifes and plastic spatulas, cutlery, plastic plates, bowls and mugs/glasses, couple of scouters and dishcloths etc.
Easy camping meals are (obviously!) one-pots and things you can fry, so, a few ideas:
sausages with the prepared polenta that you pan-fry
omelettes/scrambled eggs
any kind of one-pot such as curries, simple casseroles, risotto
"Treat" meals like fried potatoes with garlic and grated cheese etc
Fried cheese and ham sandwiches
Tinned things like baked beans, spaghetti & sausages etc
Ready-prepared soups
Chilli