BLS and ACLS are not substitutes for, or equivalent to telemetry training. There are loads of sites (just search) that will help you understand the different rhythms. Telemetry training should include not only rhythms, but cardiac anatomy and function. I don't know of any certification courses other than what is offered in hospitals for training purposes. If you don't work at a hospital, you can just call your local hospitals and ask for the education department. Most classes are open to everybody, non-employees just have to pay a fee.