Rule #1: FOLD unless your hand is Q-6-4 or better.
Seeing Additional Cards: Other Players' Cards
If you don't have Q high or better, fold unless you can see the following in other players' hands:
a) 3 additional cards all of which are Q or higher
b) 6 additional cards of which at least 4 are Q or higher
If you are holding Q-6-4 and the 6 additional cards you can see are all Jack or less, fold.
Seeing One Of The Dealer's Cards
Some three card poker dealers sometimes carelessly reveal the bottom of a card when passing them from the automatic shuffler to the table. Seeing just one of the dealer's cards is equal to seeing 40 other cards. Seeing one of the dealer's cards gives you a significant 3.48% edge on the house. If you are so fortunate, this is a great time to bet the table maximum based on the following:
Play all hands if the dealer's card is a Jack or less
Play Q-9-2 or better if the dealer's card is a Queen
Play K-9-2 or better if the dealer's card is a King
Play A-9-2 or better if the dealer's card is an Ace