http://www.acesewvac.com/jano-mc5700.html
This site will tell you what's supposed to come with it. BE CAREFUL! Sometimes auctioneers don't know what they're doing a separate the accessories from the machine.
If you have a Janome dealer near you, call them and check what pricing would be considered normal and also ask if how much they would charge for a cleaning/maintenance check.
Oh, I think the age would be around 2000, 01 or 02 when they came out but I could be wrong. It's a computerized machine so it can't be terribly old. You might see if you could plug it in and make sure it works.