If you want to learn to run, for no other reason than to avoid any danger, then the basics that I went through should get you to that point.
If you want to run for pleasure, I would suggest that the next thing to do is get some fitness level at the gym and also speak with your prosthetist.
Once you are sure that it is safe for you to proceed, ask as many questions as you can and use the links page for information.
I would imagine that if you are at this page, you have read about my journey and the advice that I was given. I asked a lot of questions and was also very fortunate to have a great coach in Julian Wills who, really and truly, treated me as he would any able bodied runner.
Please, please take care and good luck!