Get a copy of this book:
Gregory N Brown "The Savvy Flight Instructor" isbn 1 56027 296 1
its got lots about how to attract and keep students. USA orientated of course, but the points are valid anywhere.
Its a few years old and doesn't, therefore, have anything on the internet but again that should be obvious once you've read it.
Basically: network, get out there and talk to people anywhere you can, advertise (internet), offer something better than the rest.
Good luck
H