Maybe this has been asked and answered here before, but I can't find it if it has...

I'm not interested in using a VTT for a direct connection to my players, but more to load premade photoshop maps so that I can maneuver the tokens and whatnot, and then export a screenshot to EN World.

The question I have is about resolution... dpi, ppi, csi, fbi, whatever; is there a minimum screen size/resolution that is considered standard? Basically I'd like to make a custom preset size in photoshop that I can just open and start drawing.

Thanks in advance.