Using one card per day, say out loud the R7 and R3 chord tones for the chord. For example, if the card has the key F on it you might say "Key of F, F and E flat for dominant 7th or minor 7th. F and E for major 7th, F and A flat for R3 minor, or F and A for R3 major."
Next, move on to the next key till you finish all four keys on the card. Even though you might be tempted to move to a new card, I'd suggest instead that you work on the same card SEVERAL times throughout the day to really get the information and theory down for just four keys.
This will prevent you from getting overwhelmed and it will help you to keep the information in your brain longer by drilling it over and over.