How to train kickboxing(or just boxing) with a punching bag?

It will be a while(maybe a month) before I can go to a regular cl, but in the mean time, how can I train myself? Is it possible to use a punching bag to make me less likely to flinch?(I have tried one drill where I swing the bag and try to stop it with a kick in order to imitate a defensive kick.. Is that any good?)