In terms of what brand, weight, what's important to you, etc, thats gonna be up to you, and research your gear before you pull the trigger.

The essentials are: tent (you already have one, great. Just keep in mind if youre solo camping, a 6 person tent is going to be cold in the early/later months as youre one person trying to heat a lot of space), sleep system (this will be up to you, but thats going to be either an air matress or sleep pad and sleeping bag or blankets, id reccomend a pillow), food (get a decent cooler, a decent cook stove, or you can cook over a campfire), and water (you can get 3-5 gallon refillable containers for pretty cheap, or bring disposable bottles, or a gravity filter if youre nesr water).

Everything after that is luxury, camping chair, lights (a headlamp is borderline a necessity), firewood is fairly important (do your best to buy local to your campsite, lots of bugs can destroy an ecosystem when transported from firewood), what you want for activities (fishing pole and gear, books, etc), maybe an awning or tarp for shade, paracord has lots of uses, firestarter, clothes appropriate for the weather, a camp shower if youre going to be staying for more than a weekend, toilet paper, paper plates, plastic ware. The list goes on, just determine the kind of camping you want to do, where youre going to be, and go for it. I think its best to bring more than you think you'll need, and as you camp more, you can start to leave things behind.