Here are some exercises to help you become more familiar with 16th note groupings. Count out loud as you play each one and tap your foot to help you keep time. It would also be useful to practice them with a metronome or drum machine. If you are serious about music you should be using a metronome for everything you practice. A musician with good control of rhythm and timing is always popular with other musicians.
Once you are comfortable with these basic 16th note groupings, it is easy to create great sounding keyboard parts using simple patterns. The following parts use the right hand only and leave space for call and response with other instruments.