Tracy - Don't worry about flooding your atty! When you decide to try dripping (without using the cartridge), blow out all the primer juice (if you haven't already -- blow from the bridge end at least 6 times), drip 6 drops into the atty, blow a couple more times to get rid of any more primer liquid that might still be at the threaded end of the atty, drip 3 more drops, put on the drip tip, and vape.
After 6 to 12 drags (depending on how long you suck on it), you'll need to add 3 more drops. If you don't add much more than what I've listed here, you won't flood it. If you do, just rinse it out, blow out the excess water, let it dry for a while or blow dry with a blow dryer, and it's ready to start over. 6 drops when it's empty, 3 more drops after you vape several drags -- or when you get a slight burnt taste. At that point, you could add 4 or 5 drops.