Support groups come in many flavors, from an informal get-together once a month to bounce ideas around to a well-organized co-operative schooling effort. There are support groups that were formed when a couple of families started getting together to play in the park and others that began as extensions of church ministries.
Before getting involved in a support group, decide what type of support you are seeking. Make sure the support group you are considering shares your beliefs. Be sure not to over-extend.