For Oxford shirt.
Starch Back side of collar, iron it, don't worry about wrinkles.
Starch Front side of collar, smooth with hand, iron it.
Starch Yoke, smooth with hand, iron it.
Starch the button holes, smooth with hand, iron very slowly while stretching it.
Starch the side attached to the button holes, smooth with hand, iron the pocket first if present.
Starch half of the back of the shirt, smooth with hand, iron quickly only paying attention to the pleat.(You will wrinkle the shit out of the back as soon as you sit down anyway.)
Same with next half of the back.
Starch the front side of shirt with the buttons. Smooth, Iron, dodge around the buttons, if you have a nice iron, there will be a groove that will go under the buttons.
NEVER TOUCH THE IRON DIRECTLY TO A BUTTON. THEY WILL ASSPLODE!!!!
Starch one of the cuffs, iron completely, watch out not to wrinkle the fabric near the stitches.
Lay out one side of the sleeve, watch the pleat, smooth carefully with hand, form the top crease manually, then iron slowly.
Flip, starch, repeat.
Then repeat at the cuff of the other sleeve.
BOOM you are done.
If you want it really crisp Starch the whole shirt first, then wad up the shirt. Then go through all those steps listed above. That way you will not miss any parts of the shirt.
If it is a button down, BUTTON THE DAMNED COLLAR DOWN, even if you are not wearing a tie.