The quest map tells you everywhere to meet your opponent's. So just go around until you have beatan them all. Be sure and save quite often because during your travels you run into other missions to do along the way. For lower lvl player's some may be challenging. All the opponent's I came across used deck's heavy in spy and medic cards. So you might want to counter that with a monster deck lesder that double's spy card value it does work both wats though so keep that in mind. If you are low on money you can take your chances on betting big but you really don't gain alot. You can play them until you win. That's when you will receive the Skellige cards. Don't get frustrated just have fun.