I would like to get some referrals on a start point into FreeRadius.

Hey, My name is Eliezer Croitoru and I was interested in FreeRadius since long ago but never had the chance to get some guidance about the right path with it. I must say that most of my experience years are with PC and just now started with more advanced setups. I wanted to integrate squid with FreeRadius in some setup but unsure where and how would be the right starter point. I have seen setups with LDAP and it from a reason seems a bit complicated to my eyes since I do not have enough knowledge about it. So in general I am looking for recommendations about the right path to learn. Thanks, Eliezer