Probably the most comprehesive trail maps, GPSr tracks and waypoints todate can be found on the Gorge Rat Home page ... www.linvillegorge.net
We'd be more than happy to help you out there. One thing you need to remember it's a wilderness area and you are allowed to camp two nights and three days ... then you need to be out of the wilderness for a night. That's more than easy to do though. The loop you are looking at doing ... that's not the Backpacker's Magazine published loop is it? If it is ... their description and instructions are pretty hinky and can get you in a bit of trouble if you're not careful.
We have a master map you can print off and use ... even if you don't use a GPSr ... and it's free for the download. We have a full scale map you can take to some place like Kinkos and have printed or the same set of maps in a PDF form that can be printed in a booklet to take with you.
Three days to do 22 miles might be a bit more than you want to chew on ... especially if this is your first trip. Gorge Miles are completely different from AT miles ... as a comparison. Besides there's a lot of things to see pretty much along any trail or series of trails you may take. Most trails are maintained by voluteers but it is a wilderness area and you can fully expect blow downs and scrambles ... and very very few signs other than at the trail heads.
Note: Camping near trail heads ... must be a minimum of 200 feet from the trail head.