auto keys

Creating automatic keystrokes: I have an injured right hand and am looking for a way to automate so that I can press two keys that will automatically put certain things on my computer. For example: if I hit "control A" or "alt X" it would put (for example) my e-mail wherever I have the cursor pointed. I would new text file where I can change what each thing means.- again for further example "alt Z" would be "my e-mail address" (I don't mean the words "my e-mail address" - I mean my actual e-mail address). Ideally, there would be four or six of these. Using the left side of the keyboard. "Control a, control S, control Z, control X" - all of which are obviously in easy range for me to use with my left hand. Alternatively, I could use the "alt key." In the same concept. The text file MUST be changeable. So that I can change or update what I want each set of keystrokes to represent.