I'm going to start weight training today. I'm hiring a personal trainer to teach me how to lift the free weights. Then I will decide if I want to join the gym or just by some weights and do it at home. I have two questions here:

1. Do you think that lifting weights will help me slim down or will I simply stay the same size but just become more muscular?

2. Do you have any suggestions for what I should be sure to ask the trainer? I'm hoping to get a good idea of how to use the equipment properly/good form, how heavy I should start with, perhaps how any of the lifts can be modified to work with dumbells (I see they make dumbells with plates you can exchange), and maybe what core lifts I should do for generally building all-over strength. Anything else I should make sure to ask?