You are going to want to get into a proper 4 channel trainer, or something fairly basic. The plane you purchased will be some fun, but it does not introduce control of the roll axis. If it were me, I would buy a Sig Kadet 40, or a GP PT 40 or a Tower Trainer 40 for our second plane. All are easy to build - I enjoy the building part as much as anything - and are good in the air. I believe that the best part of this hobby is the joy you have when something you built takes off and actually flys, that is just not something that you can get from an ARF.