Tonight will be the encore of the pilot episode of "Better Call Saul" with the premiere of Episode 2, too. However, if you never seen "Breaking Bad", you might want to start and finish that series before watching BCS. The pilot episode has an introduction of where Saul currently left off from after BB, which may or may not continue later on in the BCS series.
There is familiar faces from Breaking Bad. However, there is no Bryan Cranston "Walter White", but Aaron Paul "Jesse Pinkman" will be returning, and already a couple of unmentionable actors that were on the BCS pilot episode.
However, I am already digging this show, and hope it is better than Breaking Bad. Though, tbh my favorite character on Breaking Bad was Saul Goodman, so yeah.