Chain link fencing usually comes in 20 rod and 50 ft rolls which can be joined by "unscrewing" one of the end wires and then "screwing" it back in so that it hooks both pieces. 
Common heights include 3 ft, 3 ft 6 in, 4 ft, 5 ft, 6 ft, 7 ft, 8 ft, 10 ft, and 12 ft, though almost any height is possible. Common mesh gauges are 9, 11, and 11.5. 
Mesh length can also vary based on need, with the standard mesh length being 2". For tennis courts and ball parks the most popular height is 10 ft, and tennis courts use a mesh length of 1.75"