Putters with more forgiveness and stability like larger mallets typically provide superior distance control because they maintain consistent ball speed and roll even on mis-hits. Unless you’re exceptionally accurate with your contact point (repeatable impact in the center of the putterface) don’t fall overly in love with the more traditional head shapes.
Start at address so you can ensure that you have a flatstick that fits your body and posture. Unlike full-swing clubs that droop and bend significantly in a dynamic motion putters stay about the same during the stroke so getting a length and loft that complement your setup is an important first step.
Available in both white and yellow the new and improved Q-Star Tour ($30/dozen) golf balls are aimed at players with moderate clubhead speeds that desire Tour-like performance with a soft feel and lower price.