Select a time and day that doesn't conflict with other events and provides for good attendance by the people in your lake community. Reserve a convenient location a public place is best like the town hall, a resort or school. Invite everyone living at and near your lake. The meeting should be well-publicized in advance. Prepare a news release for your local newspaper and buyers guide.
Most papers are happy to print such notices.
Put posters at local grocery stores, community centers, sport stores, etc. You may want to send personal invitations to certain potential members. Have extra copies of the agenda. Have a sign-in sheet for names and addresses. Start on time and stay on schedule.