Downloaded 3000 CD's To External Hard Drive

Finally....I have my cd's scattered over three computers, two cars and two storage units, and now I want them all together on one unit (4tb SeaGate)

I use JRiver....are there any special setting I should use BEFORE I spend three weekends loading them? I would like to have the release date attached instead of just the year it came out.

Any help or suggestion would be greatly appreciated.