The rules of Spades
Four players in two partnerships, partners sitting opposite, with a full pack of 52: thirteen cards each, and the ace high in every suit. Spades are always trumps.
First everybody bids the tricks they expect to take, from the player after the dealer, once round. Your side's bid is your two bids added up. A bid of nothing is nil: a promise that you, alone, will take no trick at all. A side 100 or more behind may bid blind nil, before looking at the cards; then the bidder passes two cards to the partner and gets two back.
The player after the dealer leads. Follow suit if you can; if you cannot, play anything, a spade included. The highest spade takes the trick, or else the highest card of the suit led. Spades may not be led until one has been played on another suit, unless the leader holds nothing else.
A side that takes at least its bid scores ten a trick bid, and one for each trick over. Those tricks over are bags: every ten bags cost the side 100. A side that falls short loses ten a trick bid. A nil made scores 100, and a nil lost costs 100; blind nil is 200 either way. The tricks a nil bidder takes do not count towards the partner's bid, but they are bags. The first side to 500 wins, unless the table plays to 250 or 300; both there on the same hand, the higher score wins.