At least 3 friends, if you are playing for money; if not, it is possible to play by yourself, but not very fun. 1 friend should do, but the more, the merrier. Optional: Card table, but regular tables work, and you need somewhere to put your cards.
The game of poker involves both luck and skill. In the short term, luck can play a significant role in determining the outcome of individual hands or sessions. However, over the long term, skill becomes a more important factor in determining success in poker.