Howdy!
Glad to see you are interested in Flesh and Blood. Here is a video that I think you should watch before making a purchase.
Like the video mentions, I would also recommend getting a Classic Battles Rhinar vs Dorinthea and maybe a box of Welcome to Rathe Unlimited to start your collection / add new tools to your brand new decks.
Otherwise, you can always try the blitz precons: Fai and Dromai
Good luck and I hope you enjoy the game.