When having a designer work on your logo try to fill out a design brief so they can get to work on as close to your idea as possible.
A few helpful things to keep in mind are:
- Name of your company
- Do you have a slogan?
- A small description of your business.
- What industry is your business part of?
- Look online for some sample logos you like.
- Do the same for logos you dislike.
- What are the primary colors of your business?
All these things will help a designer in capturing your vision.