All the guilds I belong to have websites. Part of it is public and the member section is private. The websites cost so much a year, a good secure one is not free. You also need someone to be webmaster. An out of date website is useless.
The best way to get new members is to be active in community events. Set up a table at all possible venues and pass out info, have a display of quilts, and be enthusiastic and happy to be there. I see so many groups sitting at their info table looking bored, sullen, and just sit there while the people walk by. Have a simple make and take item or at least the how-to written up to give away. We demo yo yos, folded coasters, self mitering blocks, have the pillowcase in each part of construction to show. We always have interest when we set up a table and have gotten quiet a few new members over the years .