Here's a link to a video that is a documentary of a kid that visits some of the waters where Sir Isaac Walton fished and wrote the Compleat Angler. If you've ever gotten a trancendental feeling while fishing, you'll enjoy it.
I have recentley acquired a copy of the complete anger.I dont have any specific value for your copy but copies that late tend to only have any substantial value if they are in pristine condition or have exceptional illustrations ie the Rackham editions .