Assessment is a sim ride that involves an ILS in the Dash 8 sim, standard stuff with no abnormals apart from a missed approach off the ILS if you could call that an abnormal. Friendly interview, more of a personal interview opposed to a technical one, and they have a technical questionnaire that is reasonably general and logical.
In terms of command, expect to be in the right seat for at last 12 months. If you do we'll in all your sim training, subsequent cyclics and line checks, etc, you shouldn't have to much trouble getting a command. Just be prepared to learn.
Good luck.