Legacy LVUG Community

When I go to my master sources I notice several sources for the same year census.  I don't know which one I should choose and when I choose one it has a box for source details.  Can someone tell me how to decide which census to pick and what information goes in the source detail box?

My name is Mitch Parker.  I was born and raised in Kentucky.  I started doing genealogy approximately May 2010.  I have been using Legacy since then.  I believe I started with Legacy 5.  I now am using Legacy 8.I am searching the following direct line surnames: Parker, Elliott, Harp, and Bryant.  I first learned about LVUG approximately two years ago when Linda McCauley mentioned it in a workshop.

Does anyone know if Legacy has the ability to advise you of alternative births, deaths, etc.?