I did this but backwards. I bought a 5 x 5 first then bought a couple 2 x 2's. The 5 x 5 was for main production and the first 2 x 2 was to house mother plants and the other was for quarantining plants, seedlings, rooting clones, etc.
I have a little bit of experience growing so buying the big tent first was ok. In your case, starting with the 2 x 2 was smart. Now you have a better idea of what is needed to pull off a successful grow and can be a more informed buyer when you step up and expand your grow space.
I use AC Infinity for grow gear and Bestva for lighting. I've heard some good things about ACI's lights so if you want to go with a kit you can also include the lighting they offer.
As far as your fans, I don't like to have so many fans in the tent. Just more stuff to break. One on top and one below as Bossman, i.e. @Captspaulding , suggested would be perfect. In a 2 x 2 you don't even need a 6" fan. A couple of 4" computer fans top and bottom will suffice.