1. the dealer is randomly chosen
  2. the opponent is chosen for you
  3. everyone places their bids*
  4. your and your opponent’s bids sum up, and you need to reach this number

*bid – the number of tricks you expect to take.

the highest card of the same suit (spades, hearts, diamonds, clubs) wins

spades ♠ beat every other suit 

you can't play spades if you still have a card of the same suit as the card being played by the dealer