Just got a personal trainer... now what??

So my husband and I just hired a personal trainer. We really need the guidance, motivation, and accountability so we decided to sacrifice some of our personal monthly expenses to get the PT. This is the first time we've had a personal trainer so I want to make sure to take FULL advantage of the services.

Do you all have any tips for me, any questions I should be asking, suggestions, what I should expect from the trainer, experiences you've had, things you wish you would have asked your trainer to do with you? Anything at all would help. I want to make sure to get every ounce of work and sweat out of this experience.