Am I shuffling these cards frequently and repeatedly, or once per game?
There are actually several decks in the game. The Draw deck is used probably the most. But you only go thru the deck once per game.
Are the cards handled a lot and passed around, or are they placed in front of the player and not moved for most of the game?
They are placed in front of the players and aren't moved too often.
Are the cards double sided?
If you're asking are asking do they have printing on both sides, yes.
Though one side is just the card backs.
Are there many cards or just a few?