In most rook versions, the point cards are: 1 = 15 points 14 = 10 points 10 = 10 points 5 = 5 points Bird = 20 points
This depends on which version of Rook you are playing.  I personally prefer to include the 2s, 3s, and 4s, as it makes for a slightly more challenging game.  But beware, bidding 150 is much more challenging.
The game of Rook is one of many games that this decks works perfectly for.   Note: there are no point values printed on the 14s, 10s, or 5s, but if your group is familiar with rook, this is not an issue in the slightest.
Yes. The cards are the same size as the regular rook playing decks.