during the day, crappie can move around in small schools. this early in the season, you should focus on weed patches, the weeds will still be green which attracts plankton; this in turn attracts small fish, which attracts and holds crappie.
first thing you should do is move around. any time you're not catching crappies for more than 15 minutes, you need to pack up and find another spot, namely a weed patch or hump/sand bar. stick to 15 foot of water or shallower, as crappies don't generally go deeper than that this early in the season. (that said, be prepared to shake it up if you're not finding anything.)