Get started with a personal text and email.
In terms of what works best, the simple rule is that the more personal the request, the greater the chance a person will join and support your club.
For example, a simple way to get started is to message everybody who is involved with the club with a link to your club’s page asking them to join. Ask them to forward the message on to anyone they think would also join.
A personal email will have the same effect.
Remember to let people know what the lottery is all about, how it will help your club and to include the link to your page.