There's more than a few groups around.
Some at Saltire, some at Games2d4, some at Game Preserve (Fashion Mall & Southside).
There's a few FB Groups for Indiana/Indianapolis area Classic and Alpha Strike Play. I don't have links handy, but are Indiana Battletech or Indianapolis Alpha Strike or something similar.
More than a few folks in those groups that are willing to help people learn how to play. i'm one of them, but most of my May is spoken for already.
There's an AS game supposed to happen at Games2D4 May 22 that I don't think is new player friendly, but there may be a way to get a second table up for new players.