Usually just 2-3 drops on the atty, then vape a while ( I get 6-9 draws on it) then another 2 drops or so...
If you do flood it, unscrew the atty, just grab a tissue and blow into the open end with the tissue wadded by the threaded end to catch the juice and blow out excess, wipe atty, wipe battery at the connector area real well also then you should be good to go. Sometimes a lil swish and a few blow-throughs in some pure grain alcohol (vodka, everclear etc...) will clean it out also. That works for changing flavors too =)