In most cases a well tuned carb should start with little or no pumping. Set the choke, if its actually required, then smoothly give it about half a pump to set the fast idle cam. In not so cold weather give no choke, no pumping a try. If the choke blade is closing fully that's usually too much choke. I don't have the figures handy but even at full choke there should be 3/16ths to 5/16ths gap at full choke. If it's closing fully it needs adjusted.
I'm assumming that you're just talking about having an overly rich mixture. If by flooding you mean raw gas running down the venturis or out of the carb the you have a float setting or a stuck float problem.