There is an actual camping board (under Travel).
This is an excellent tent at a very good price www.millets.co.uk/15980932/eurohike-rydal-500-5-person-tent-15980932/?utm_source=Google&utm_medium=cpc&utm_campaign=Shopping&gclid=Cj0KCQjw6NmHBhD2ARIsAI3hrM2wiHONg6Md3hqc4F8w48O_8Fq7d83LsbbJcmDbtANOCzltMhUFNWgaAlngEALw_wcB&gclsrc=aw.ds
Are you quite relaxed, hardy types? The initial outlay on camping is high, but your Ds will almost certainly love it.
Are you ok sleeping on blow up beds? They are the cheapest option but many people prefer SIMs (self inflating mats). Thick ones are very expensive though.
Cheap sleeping bags are ok if you also take some fleece blankets. Or just take your duvets from home. A sleeping bag is good for kids in case they kick a duvet off in the night.
A stove. Start simple, on of the little suitcase stoves that run off a canister that looks like an aerosol. And plan very simple one pan meals.
Have you got a portable BBQ?
Folding picnic chairs?
A folding table is really helpful.
Torches and lanterns.
A bucket for night time wees.
Plastic plates etc, take old stuff from home.
Buy a 5l supermarket mineral water bottle and too it up from the tap for water at your tent.
A cooler - a campsite that lets you freeze blocks in a freezer and keep swapping them is handy.
A plastic washing up bowl to carry your stuff to the sink.
If high winds are forecast think twice. A lot of people lost their tents in the storms of last year, and it is frightening for kids. Once you are more experienced don’t head out without watching the Cross Camping You Tube video on Storm Guying.
In fact watch Gary Cross videos on almost all camping aspects 
Packs of brioche rolls, satsumas and bananas for breakfast.
Take flip flops for the showers.