I was never really in to the Targaryen lore after reading the main book series (more of a Stark man), but I've gotten in to it after reading GRRM's latest Fire and Blood (history novel on the family).
It should make for good drama/tv.
I haven't read Fire and Blood (I'm done giving him money until I get Winds) but the write ups on each Targaryen king in The World of Ice and Fire are great! Some of these Targaryens make Viserys and Aerys look like stable great leaders.
There were also a couple of short stories on the Targaryens inn the Author Anthology collection Dangerous Women and Rogues.
This new show won't spoil Winds for me so I'll probably watch.