Step 1: Find an AHA instructor course. Through your employer, on your own, whatever...
Step 2: Take instructor course. Pass course. Paperwork is filed saying you need to complete your observation teach.
Step 3: Find an AHA Training Center that will allow you to do your observation teach (usually this can be done at the same Training Center you took your instructor course at.)
Step 4: Training Center contacts AHA to tell them you have completed your observation teach. You are now an instructor.
Now, just because you are an instructor does not mean you can go forth and teach. In order to teach you must be affiliated with an authorized AHA training center. That is who all of the course records and certificates go through.
After you have been an AHA instructor in good standing for 1 year (it may be 2, but I'm pretty sure it is only 1) you can apply to become your own Training Center. Then you are able to teach under your own name.
The bottom line is you really end up having to teach for someone else's company for at least a year before you can go and create your own Training Center. Sometimes this is as simple as the company putting you on their AHA agreement, and then charging a small fee per student to allow you the privilege, or as stringent as you can only teach when they want, where they want, and who they want.
This is poor timing to become an instructor. In fact I believe AHA is not allowing any instructor classes at the moment, unless you have specific national approval. It all has to do with the roll out of the new standards and material. Once the new material is out and available and all current instructors have oriented, then AHA will lift the restrictions and allow instructor courses to resume as normal. I have heard this will be around the end of March to mid April.
This is my understanding of the process. I could be corrected on a few points, but I believe the info I am writing to be largely correct.