The 15 members of the Charter Review Committee met for the first time Tuesday night, including the six residents appointed to serve on the group that will make recommendations for how to change the document described as the Town’s constitution. An overview of charter reviews was presented during the virtual meeting by attorney Lauren Goldberg of KP Law, who said the amendments to the Watertown Home Rule Charter could be as minor as changing the wording and fixing grammar and as major as changing the form of government (such as having a mayor or going to a Town Meeting) or changing the way members of a board are selected from elected to appointed. Depending on the magnitude of the change, Goldberg said, the final approval may only need approval of the Town Council and approved by the State Legislature for a small change or having a ballot measure to be approved by Watertown voters for big alteration. The committee will get help during the review from the Edward J. Collins, Jr. Center for Public Management at UMass-Boston, which studies municipal governments in Massachusetts and across the country. Town Council President Mark Sideris said that he hopes to have someone from the Collins Center at the next meeting, on Oct.