1. Yes, you can use no RAID controller. 2. The difference in performance between a single-disk RAID 0 on an H310 and non-RAID will be negligible.  Performance of a single-disk RAID 0 on a better controller, like the H700, would be significantly better than non-RAID. 3. If you have installed an OS before, then this is not "terribly" different ... it is more advanced, but it is the same concept.  Managing the server is a different story.  
I am about to buy T320 Server, having some question, It's just very small office use (2-3 user) ,  1. Is it OK if it has no Controller/Raid configuration?   I can save 128.97 (hot plugged - chassis) + 160.57 (H310 PERC)  = 289.54 $  2. If  I buy both items above (Chassis + H310) but  use only 1 HDD (config H310 PERC to No RAID), Does it has any differnces compared to NO Raid/No controller  3. For the installation , Can it be done by normal user with basic computer knowledge?   the installation cost so much  354 $   ouch!
T320 Tower Server With Raid/No Controller , Will it work?