Flatwoods II 4-Person Tent

I own 3. I think this is reasonable for one with multiple camping situations. Really like this one you've posted in the photo. The older I get and the more tents I buy (and often let go of), the more I appreciate the dome setups. I have two identical Coleman's Flatwoods II with 60" headroom that are my go-to even when solo camping. (No backpack camping) When cared for and stored properly these are an ace-in-the-hole. All criss-cross dome setups are subject to pole deterioration so I don't count that against the manufacturers.

I probably use my 4-person Coleman tent from Target more than I use my 2-person Marmot because it fits my family. By myself, I'm choosing the better tent every time. The Marmot is basically the same as the REI halfdome. A bit heavy for backpacking but light enough for a few days on the trail. I will say the biggest obvious differences are the ease and speed of setting up, the smoothness of the zippers, and the strength of the aluminum vs fiberglass poles. Those make a big difference in the day to day use. The finer points are the seam taping and sealing, the screen quality, and other details that make a difference but you don't notice right away.

6 person tent is nice and roomie but you only need a two 4 person tents. I'd go Coleman as a basic tent it comes with everything but a tarp to lay under it. Scouting they usually tent two to a tent with smaller kids having an extra person in their tent.

You're getting into a new hobby. Don't drop thousands of dollars up front. Buy a Coleman 3 season tent to start. Same goes for the sleeping bag, just get one with temperature rating 10 to 20 degrees Fahrenheit less than what the daily low is said to be. If your not hiking into the campsite get regular camping chair and cooler. Same goes for a sleeping pad. Get a heavily well reviewed sleeping pad.  If I was in your shoes and your okay spending a little bit of money. I'd just go to Walmart or Academy sports and buy a tent, bag, pad, and chair there, if car camping. If you wind up enjoying yourself, use the tent and chair until they quit and then upgrade.  Buy a better sleeping bag and pad once you know you're enjoying camping. Waking up well rested helps you enjoy the experience more. 

X = number of people camping, Y = rating of the tent. X+2 = Y for gear space, and a vestibule for inclement weather cooking is really nice. Looking at the tag on the tent we bought a Coleman three season to use camping at the Grand Canyon, it said 8, we had 4, it was just right for size. I've camped two in tent meant for 4, it allowed a cot and stored our gear inside with us. I've moved on to building a DIY camper and keeping that in mind. Queen mattresses and 3 bedrooms are a bit much.