STAR (Standard Terminal Arrival Route) by definition is a link between enroute and final approach. Your enroute flight plan has an end point on your flight plan and you usually can find a STAR that connects to that point and leads you to final approach. You will find different STAR's starting from that point leading you to the RWY in use. Sometimes the STAR is called after the end point to help you identify it.
If your end point is for example called FUNNY then you might find a STAR called FUNNYA for RWY 01, FUNNYB for RWY 19. Works for SID's as well.
Sometimes the end point on the STAR is the same point as for the Intermediate or Center fix on the Approach plate. Sometimes the STAR ends in »»»»»»»»»» which means it will end with Radar Vectors.
Hope this helps...it will get easier.