Just started DMing, and in a moment of hubris had a npc challenge the party to a game of cards. Which one of the players was proficient in. when asked the reasonable question of "ok what now," I realized I had no idea and a quick skim of the DM guide and PHB (and a longer look later) revealed nothing. something that could have been fun and a nice character moment turned into a "sorry guys let me just throw something together and move along"

QUESTION(S): Are there rules in 5e for what rolls/checks/contests are necessary or expected when using a gaming set? When and how would proficiency come into it? what other skills and proficiency's could come into play ex: a sleight of hand check to cheat at cards.