a smaller well known track would be the best place to start
Nordschleife is so big that many new racers would be turned off and the amount of accidents and moving chicanes would be the death of the experience=no fun
Spa would be terrific
silverstone with its gazillion layouts and the cars available are a good match
as is Brands Hatch.
LimeRock is nice if a bit simple-
Road Atlanta class act, Laguna seca? one layout is this what LFS needs right now (of course a reverse UP the corkscrew would be cool)
Sonoma-Sear point is a better fit currently at least 2 layouts, and reverse...
Suzuka (is KY GP similar?) would be great, as would be Barcelona or Valencia
Vallelunga is also a nice one...