What do you think your style will be?
I prefer wilder style / back to basics sites where you can camp where you like, there is usually much more space, and you can have a campfire. I often cook over the fire.
Other people prefer to use EHU with more mod cons, but it means you get set pitched by the electric posts and tents are closer together.
I avoid packed busy sites where tents are closer together in rows at all costs!
But that’s just a camping style preference.
For 2:
A 4 person tent tall enough to stand up in in the living area and at least the front of the sleeping pod. Search Millets 4 man tents for some great bargains. All the brands they sell are OK. A simple tunnel tent (hooped poles making a tunnel) is easy to put up. Inflatable tents are heavier and bulkier to pack.
Mallet, spare tent pegs
Sleeping: you need insulation from the ground so many people prefer SIMs (self inflating mat) which have a memory foam core. A fleece blanket on top and sheet, then duvet is good if you don’t want to buy sleeping bags straight away.
Stove of some kind, kettle, pan, kitchen gear for simple cooking, washing up bowl and liquid, mugs, glasses, plates, bowls. I take my cafitiere.
Portable BBQ if you fancy it
Cooler, unless you are relying on tinned and dry food that is ok without.
Table, folding chairs.
Torch and lanterns.
Toiletries, flip flops for showers, bag you can hang everything up in at the showers. Butchers / S hook to hang over door and hang toiletry bag on.
Water container: buy a 5l flagon of supermarket water and keep re-filling it
Matches, batteries, citronella candle, insect repellent, wipes, anti bacterial wipes, toilet roll, tissues, treats and little luxuries. Ear plugs, eye mask
Solar lights to put by your tent pegs at tent corners.