30 teams with 23 active players each. 30 * 23 = 690 players. This doesn't include any players on IR though. Other players can be called up to replace them and the IR players don't count towards the 23 man roster limit.
Teams are only allowed to play 20 players in any game. The normal breakdown is 12 forwards (4 lines), 6 defensemen (3 pairings) and 2 goaltenders. The other 3 players on their roster are "scratches" and are not allowed to participate in that game.
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If you count players called up from the minors to replace injured players, you're looking at approximately 700 NHL players.
As of now, there are no openly gay hockey players in the NHL. However, in a recent poll of all NHL players, over 80% of them said they believe they have a gay teammate.
That is how many players is needed on a NHL team.
This question is difficult to answer as the AHL is the main development league for the NHL. While some gifted players come right out of junior, college or Europe and step right into the NHL, the vast majority of NHL players have played in the AHL at some point for varying amounts of time until they have developed their skills. There is, obviously, no rule about how many players can come from the minor league. NHL teams recall their players as they see a need.
There have been a total 212 Minnesotans in the NHL (197 skaters + 15 goaltenders) as of January 2011. Minnesota has produced the most NHL players from the U.S. states.
All of the teams in the NHL have American players.