I was wondering what sort of sizes work best for the comic pages in pixies, or inches.
Sort of new here, wanting to know how large of a format to work in.

The maximum allowed page width is 960 pixels. If you post something bigger than that, then Duck-O-Vision automatically compresses the image and resizes it down to 960 pixels. Um, unelss they disabled that feature at some point while I wasn't looking...
 
But that doesn't necessarily mean you should work at that size. It's always best IMO to worl at a larger size, in case you later decide you want to take your comic to print or at some point publish a PDF or post someplace that allows bigger files. So the first thing you should consider is where, ultimately, you see your comic ending up, and print at an appropriate size for that purpose. You can always shrink it down for DD after you're done!

Thanks for the input. I uploaded a page and it is a little bit bigger than I expected. I will try to down grade it into the smaller size.