30 feet from the net
The serving line never officially changes for any age of volleyball. It is 29 feet and 5 inches (9 meters) from the net.
You just need to be behind the end line.
(Indoor Volleyball) 10 normal paces away from the net for varsity, if you're serving overhand, if you are serving underhand, you must be at lease 15+ paces away from the net when serving. Changes may apply depending on your gym size.
You should stand behind the line, to serve a volleyball. If you put one of your legs over the line, the serve won't count.
You use the same service line as any other age. It never changes officially.
29 feet, 6 inches or 9 meters. The total length of the court is 18 meters.
If you are playing on an indoor court than you need to stand just behind the line.