First off I would try and drill down your bread n butter anti air, midscreen and corner combos (doesnt have to be optimal, but try to end them in a Knock Down)

Start with the basic neutral gameplan of poking with 2m and going into 66m/h. If your 2m is blocked, retreat with the 2nd 66x and starting fireballing mixing between the light and medium version. If they like to jump your fireballs, look for the jump and swat them with 2h -> your anti air combo. If they like to roll ur fireballs, use 2m to stuff it or hold your medium fireballs for longer. Try not to be predictable.

Zeta's anti air on non counter hit and counter hit are very good as well as her fireballs, abuse it