Creating a New Player/Coach

Is it possible to create a new "player" coach? For instance the coach I created at the beginning of my sandbox mode is now 65 - can I retire him and take over as a new coach?
On a similar note, can I create coaches that can then be found in the assistant pool?
Sorry if I'm missing this but I thought I had been able to do it in a previous version.
On a similar note, can I create coaches that can then be found in the assistant pool?
Sorry if I'm missing this but I thought I had been able to do it in a previous version.