Price?
First I'd check to see if its a real Garand and not a civilian copy. It ought to say Springfield, Winchester, H&R, or International Harvester on the heel of the receiver.
Second: what's the price? Rack grade Garands are around 525.00 from the CMP at this time.
The serial number can be looked up on the internet to get the date of manufacturer. Pull the OP-rod back and you can read the barrel date inscribed on the rear right side of the barrel in the op-rod slot.
Get a 30-cal bullet or cartridge and see how far it goes into the muzzle and check barrel wear. The less the better.
All parts intact? Does the rear sight move left to right and up and down?
Take a plastic bic pen and drop it down the barrel and dry-fire the gun. if it comes out, the rifle functions enough to break a primer.
That's what I would do to get started.