idea for creating a society for alumini of RBLD School, Mansa

An idea has been circulating in my thoughts for creating an alumini society of all graduates of the RBLD school Mansa who wish to be in touch with each other. However, as i have no precedent on which to base this society; whether to keep it informal or to regularise it at this stage, i would like people to respond with any suggestions that they may have. I feel that this society be restricted to an online medium so that past students may communicate with each other wherever they may be in the world.