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.
If you are playing on an indoor court than you need to stand just behind the line.
10,000 foot away
Without a server, that is impossible.
You just need to stand behind the line at the back of the court. The net is 9 meters (or 29 feet and 5 inches) from the back line.
You make a server
it doesnt matter as long as you dont touch the net :)