There are many gampgrounds in Northeast Georgia...state, federal and private. There are several TVA lakes...Burton, Rabun,Seed, Chatuge to name a few and each one of these lakes has campgrounds of all types. The state campgrounds most always have electricty and water hookups and some have cable and all have dump stations...you will have to go the Georgia State Park website and check. The private campgrounds I have used have water, electricity, individual sewer hookups, cable and wifi. Some of the federal campsites have water and electricity and maybe a bath house and toilets. Here again you need to check.
We are headed out tomorrow for Bald Mountain Campground in Hiawassee, GA. It's about as far north in Georgia as you can get...just on the NC border.
As far as fishing goes, all these aforementioned lakes are very old and abundant in fish....the catching is up to you
PP says that that Lake Hartwell is good...it is great. There are 3 lakes on the Georgia/South Carolina border...Hartwell, Russell and Strom Thurmond.
All these lakes have many campsites and the state parks have campsites directly at the water's edge. Go to the Georgia State Parks website and check 'em out....
Don't know if you're from Georgia but if you fish for trout you will have to have a "trout stamp" in addition to your fishing license.
Hope this helps and happy camping!!!!!!!!!