I would buy a patch panel and terminate all the wires to that. It is a little more expensive that just crimping on rj45 but it tends to easier for a new person to get a keystone connected rather than a rj45 since you can do single wires at a time rather than trying to get 8 perfect.
The simple way to test is to plug a pc into the remote room and then plug the cable 1 by 1 into a switch until you get a light. You could also plug all the jacks into a switch and then go room to room with a helper recording which port lights up. Unless you have a huge number of ports I would just cable them all to a switch that way they are set to go when ever you need it.