[Harry Lime]

I would start by calling a few games on your own, to get the jitters out and build a rhythm.

Then move onto a stream with a couple of friends to get some feedback before moving onto a college or university team where you can work for free (something like this might not even be externally broadcast, but for the entertainment of the 12 people who come to the games). I think that it will be a slow build up to landing a paying contract, like in the realm of a decade, so persistence is something that you better have.

In another life, I spent some time in the film industry, and the best advice that I can give you is to not lose sight of the fact that you are part of an entertainment product. The call will get you a job, but the delivery will get people to listen. Being comfortable on the air is going to take practice.

Good luck!