Create a New Document?

Go under the File menu and choose New to bring up the New dialog. This is where you choose the size and resolution of your new document—just type in the Width and Height you want, along with the Resolution (in this case, I choose 240 Pixels/Inch for printing to an inkjet printer). You can also choose the color you want for your background (in case you don’t want it to be white), and a color profile, if you like. At the top of the dialog is the Document Type pop-up menu, which contains presets with common image sizes and resolutions already in place—you can choose web presets, print presets, video presets, and so on. If you have a particular custom size you use (like maybe for printing on 13x19" paper), you can save that as your own custom preset. Just enter the size and resolution you want (again, I use 240 ppi for inkjet printing), and click the Save Preset button at the top right. Name your preset and now it will appear in the Document Type pop-up menu for next time.