Don't worry about using the rudder for now. There are some that will say you need to learn how to use it - and you do... Some day.

There are also those who say you should learn to drive a car with a stick instead of an automatic transmission. BS

Using the rudder is a lot more critical on full-scale airplanes, but it's not nearly so important on models.

Learn one thing at a time as your comfort level allows. When you are ready, start learning to use the right stick, but for now, stick with ailerons.