Congrats - the G20 3WD was a better buy than a driver IHMO. As a Pro (and Tour Pro to come) the tee shots aren't too long, so a very long driver might give you more trouble than fun. Maybe you can wait with the driver until you hit Master - then you'll need the length, you'll possess new credits and you'll have advanced to a (edit) level where better clubs are available. For now, you have the advantage of two rocking 3WD shots!
Roughly the same applies to the irons - wait until you don't stand it any more and buy some good high-flying clubs!
Regarding balls, they wear and get lost and thus are a steady expense. I have good experiences with the WGT SDs, 65 crs per sleeve and the little advantages against the Starters add to quite a big one: length, spin, wind ruggedness, fault tolerance, meter speed.
I gladly accept the "green fee" of 6 cr / 9 hole round - it pays off!