For tent decide what features are important to you and if its worth the extra weight. We love our 3 person Eureka Midori tent but it is not the lightest. However all the features that make it convenient and versatile like 2 doors/vestibules and a full rain fly are not things I'm willing to give up for weight. I like not having to climb over people in the dark and being able to stash gear under the rainfly but not in the tent.
Sleeping bag: I like our kelty cosmic down 20F bags but they are a pain to wash: need special soap and a front loading washer. They also should ideally be stored unpacked in a storage bin. We use Cocoon coolmax mummy liners as standalone bags if its really hot or as liners if its cold.
Sleeping pads: Teton Altos insulated pad. I sleep cold no matter what. The added insulation adds weight but makes a very noticeable difference for me. Whatever you get make sure its a 3" thick air pad.
Other random stuff: Stove of your choosing, Slime mini airpump(40061), plug kit, water filter, collapsible 2gal water bag, TP, first aide kit, tent/pad repair kit, camping chair, DIY fire starter, lighters, pots and mess kit.
We cook at the campsite and do a decent amount of dispersed camping so might be cooking on the ground. Might have to bring all our water with us if its a very dry location otherwise we source and filter stream water.
Boom, I've taken these for 3 years and they work fantastically well.
We took too much food, water, gas for the stove.
We forgot spare headtorch batteries, my friend's torch died as she was putting up her tent. My spare battery pack to recharge my phone didn't work properly, I should have checked that before. I forgot my solar recharged light for the tent.
A big success was my beach chair, similar to this one https://www.amazon.com/Ultralight-Portable-Festival-Lightweight-Backpacking/dp/B01L2DQT08/ Folds right down and stores in the nose of the kayak, so doesn't take up any space.
I also really like my Sea to Summit Pack Tap water bags. Obviously plastic bottles work fine but I like the packing flexibility of the water bags. https://seatosummitusa.com/products/pack-tap
I was happy to be paddling in neoprene shorts and a neoprene short-sleeve shirt, with a sprayjacket available if needed. I've no idea where you are in the world, but take the advice to dress for immersion seriously, you can cool down by splashing water on your arms, chest and head. You can't get warmer once you are capsized and battling to resolve an emergency situation.
Regarding the chair situation; I bought one of the A-Lite chairs that have the fold up poles.
For me the game changer was a camping chair. I do a lot more base camping/canoe camping over actually backpacking so the extra 2 pounds for this chair is 100% worth it to me. https://www.amazon.com/Ultralight-Portable-Festival-Lightweight-Backpacking/dp/B01L2DQT08/ref=sr_1_4?crid=1WUL1T3PYO7DI&dchild=1&keywords=camping%2Bchair&qid=1597618636&sprefix=camping%2Bcha%2Caps%2C356&sr=8-4&th=1