I am able to go select via mouse the "Start Numbered List" button. I know there's the keyboard shortcut for a Bullet List which is Ctrl+Shift+L.
But I can't find a keyboard shortcut for the numbered list.
I don't know any keyboard shortcut for that, but you can simply type "1." (without quotes) and then press space to create a numbered list.
If you want to create a bulleted list, simply type "*" (without quotes too) followed by a space.