The jag has sat in a garage and not started for about seven years what should we do to attempt to get it back in running condition?

Add seafoam to fuel tank this will stableize the fuel add fresh gas, pull spark plugs spray wd40 or pb blaster into each spark plug hole replace with fresh plugs make sure that everything is "DRY" before starting if mosture in on any electronic part of the car it could cause it to fail if need be use a hair dryer to warm serface to dry. make sure battery is in good shape, start car let run till up to operating temp test breaks (DO NOT PLACE IN GEAR) hold breaks down firm for 1-2 mins to make sure that brake lines do not fail due to sitting could have line rusted and you want to make sure that everthing will work properly before even moving it this includes rotors brakes emergency brakes if you are not sure and want to have someone who knows what else to do it would be a good investment to have the car "flatbeded or wheel towed" to someone you trust and have them go over the car I am guessing the car was just parked without any long time storage mesures taken spraying the undercarrage for rust prevention and rot if kept in a dry garage then you have a better chance that you will not run into problems but the basics of getting the car to roll I have told you take your time getting it up and running main things are brakes, rotors, brakelines, seals, belts, tires, hoses, electronics,battery, gas,plugs cylinder walls of engine fresh oil and filter, fresh transmission fluid and filter, fresh power steering fluid. these are the things that you need to do for a classic car like this good luck and enjoy!