Generally, it's the other way around - it's the designer who asks the questions of the client! In fact, many designers will have questionnaires they have the client fill out to specify or clarify their landscape wishes and needs and these can often be extremely detailed. But this is something that usually coincides with the initial visit or consultation....often even mailed prior to that meeting to be completed beforehand so that the designer knows how to follow up with any additional questions they may have before they get too involved in the project.

At this point in time I would assume they will be presenting you with a preliminary plan. Have them explain the plan thoroughly and their thoughts about plant selection (if the process is that far advanced at this time). Anything you don't understand or is confusing is where you will ask for clarification. Be sure to tell them if there is something in the plan you don't like - layout, plant selection, concerns that haven't been addressed to your satisfaction, if project is within any budget restraints (hopefully that issue has already been discussed and a figure confirmed). Do not be afraid of hurting their feelings - this is YOUR garden after all and it should be designed according to your wishes and preferences but with an eye to the skills and plant knowledge the designer is (hopefully) bringing to the table. If you hate a plant or placement, let them know!!

Other than these concerns, which may or may not materialize, about the only other question you will want an answer to is what is their timeline for completing the project.

Are these plantings low maintenance? Do they take a lot of water? Will you have to fertilize often? How good is the soil going to be....do you plan to add amendments?

Then you should think about a few things. Do you plan to garden much in the summer? Do you end up at the lake and only garden in the spring? Do you want to have a yard that invites nature in....or do you use pesticides? Do you plan to have shrubs for birds and add a few flowers/climbing vines for hummingbirds and insects?

Since this is the front yard, you may have covenant restrictions. If not, what direction does it face? Do you have a south facing front yard? Do you want to add a few vegetable beds for lettuce and tomatoes...maybe a few herbs. There are some lovely garden ideas for front yards that mix in herbs and flowers with a few veggies.

http://kgi.org/blog/rvisser/flowers-and-vegetables-mix-beautifully

Thanks! I got the plan and now I am getting bids for installation. I really like what they did, I asked all the questions you suggested and we changed things on the computer on the spot yo adjust the plan. I may hire this company to build, or not, getting bids now.