It's going to vary from person to person and its especially going to vary game to game depending on how each pitch is or isn't working for you.
Something simple to start off with is throw each pitch low in the zone on the corners, in a sequence like you'd do against a live hitter i.e. FB low away CB low away Fork low inside 2 seam low inside etc. etc. see what's moving and what you can spot up and where what isn't and adjust from there.
Also factor in the 8 warm up tosses you get on the mound itself.