I have 4, 7 gallon pots in a 3x3x6. That gives me an 18" square for a single pot and plant. Through HST and LST, I can make the plant fit to that space. I can also control the height of the plant through HST and LST, and strain type. An auto will only grow so big. Regular and feminized seeds give you more lee-way as to how long you veg which means you can control it's overall dimensions.
Also consider access to your plants. Depending on how much you're willing to take the plants in and out of your tent, you want to have as much access to your plants as possible. Mine, for instance, will open 360°. I can sit on a stool in front of my tent and rotate it. The tent sits on a dolly I made so I can move it around with one pinky. If you're looking for a corner to put the tent in, you will limit your access by a whole bunch. In my experience, corners are the most apt to get weed issues.
Cheeba mentioned not buying everything you need at once. Real good advice. I did the peanut butter and ramen meal plan for a week when I let the sales lady sell me everything at once.
Initial setup: Growing medium, solo cups, seeds, nutrients (depending on grow medium,) light. You can get real fine results using lights you might have around your house. Do a GWE search on using t5 fluorescents and CFL's. Since you don't need to worry about dark and light in the first bit of veg, you don't need to worry about light depravation. It's later in veg a lot of people go 18-6.
Seedling and early veg: Tent, final or smaller pots, final grow medium, final lights, nutrients (depending on grow medium,) circulation. My neighbor went from solo to 7 gallon. I went solo to 3 to 7. His plants are much bigger because of the pot size. When you put your plants in your tent, you need to make sure you have good circulation. Air filter, depending on the stank of your dank.
Flowering: You should have everything by now. Nutes should be switched to flowering nutes, as your brand suggests. If you need to worry about it, get yourself an air filter. Me, I filter the smell of my weed with my nose. My tent sits in front of my door and is always open since I'm 24/0 on lighting. My door is usually open. The smell of my and my neighbors plants permeate my patio when in flowering. I don't know exactly why they did, but two sheriff's deputies poked their head in my door, one day. One officer dropped his mask, smelled, pulled his mask back up and told me the plants look nice. But that's a different story.
So,
Sooz. See? I haven't had a dab since just before writing this and am jonezing something awful. Chipmonkeys on my back. Dung beetles under my skin.