Kit is something that comes with experience. I doubt if you'd get more than half the members of this forum to agree on any particular item of kit. It's a balance of price, performance and most important of all, preference. Some of the things that you've got now you'll stick with, other bits you'll abandon and replace.
For what you've got I'd say that you are looking at a summer camp in the hills, your rucksack probably isn't big enough to take all the kit you should need at other times of year - but again it depends on what and where you intend to work. If you intend to basecamp as it were by the car and use the pack as a daysack, then it'll work, but that isn't in my experience a load carrying system. That though is my experience from carrying heavy packs where a proper hip belt is crucial (others hate hip belts, but I'm a wimp and see no point in straining my back to carry weight on my shoulders - since that weight then transfers down the spine to the hips. Why strain your back for no reason is my opinion).
But that aside, common sense should be your guide and you can break it down into various groups:
Protection - tent, sleeping mat, sleeping bag etc
Cooking - stove, fuel, lighter, pans, cleaning kit etc
Food and water (how available, can you restock, water purification?)
Emergency - first aid, emergency shelter etc
Clothing (washing?)
Hygiene - your washing kit, foot powder etc
Navigation - maps, compass, gps (ability to use)
I won't bother to try and list more because it all depends on what you are doing and what you know - and only you know that. Think through the day from getting up in the morning to going to bed and realise that if you don't have it, then you won't have it. Then all you need to do is to reduce the huge pile of kit you've amassed into something that one man can actually carry without an entire sherpa train
Weather is always an important factor in the hills. If you haven't experience then I'd suggest getting hold of a copy of
Langmuir, but as I say it all depends on what you have already.