Hi, I'm not sure exactly what you mean but I think this might help:
If you go to the Apple logo on the top left corner and select System Preferences you can open the Keyboard icon. Select the Input Sources tab and click the "+" on the bottom left corner to add additional keyboard layouts (such as English U.S). When you click on an input source it shows you a preview. You can even press the OPTION key, SHIFT key, or SHIFT+OPTION keys together to see in the preview how it will change that according to the particular layout you highlighted. Once you know what you want then click Add.
I would also suggest checking the "Show Input menu in menu bar" check box in the bottom of the Input Sources window. This will give you a little flag by your clock where you can switch input methods.

You can even click that flag to bring up an onscreen keyboard (Show Keyboard Viewer) you might find helpful.