You must always discard a card to end your turn. You play clockwise, starting each turn by drawing a card from the stock or the discard pile. Now, you play to be the first one to empty their hand. Rummy is a shedding game: You receive handcards at the beginning of the round, and the remaining cards become the face-down stock.
Whether you play Rummy online or offline, you need at least two players, 110 French-suited cards – six of which are jokers – and a big table.