I would read more on this forum and gain more knowledge on audio first before buying anything else.
Is it too late to return what you've bought?
1st, speakers are the most important. 2nd would be subs.
Most amps, AVR, pre-pro, preamps, DAC, CD/BD players with similar specs/measurements will sound the same to most people.
Cables/wires need to have good connectors, but don't waste money on exotics.
Most "audiophiles" don't buy any audio gears from Sony or Bose.
Don't buy HTIB (home theater in a box).
Save up money for when you graduate and get that "dream system", instead of upgrading 10 times.
When I was a junior @ my university, I bought some nice gears, but I put them at my parents' house in my old room.
No way I would put anything nice in a dorm.
When do you graduate?
Career 1st. House 2nd. Dream theater 3rd.
But you can plan now.
Imagine this. Your house has a room size 16' x 18' x 10' ceiling.
You have a 120" screen ($500) + projector ($2000).
You have 5 Philharmonic-2 tower speakers ($5000).
You have 2 Rythmik FV15 subwoofers ($2000).
You have a Denon AVR-4311 ($1700).
You have a $200 BD player that also streams Netflix & others.
You have a $400 tablet that functions as everything - universal remote, wifi remote, & everything a tablet/PC does. You control all your components, thermostat, lighting, PC, etc.
Now get busy studying, graduate, and get a career.
Dream about this in the mean time.
If you can't return those Sony, it's good enough for now.