Nice little demo vid

You seem to be doing just fine there and there's nothing really to immediately improve upon.

There are some general purpose mage macros that stagger timed spells like Frost Nova and Counterspell (because you probably don't want them to be cast by both mages at the same time) and there are some clever crowd control techniques that use the focus target so you can pew pew and... erm... baa baa, I suppose, at the same time, but they're all documented somewhere here.

When you run into a problem and need help fixing it, post away, but you seem to be doing great at the moment.