Balsamiq does not offer professional services such as on-site training, implementation, or software customizations. If you are looking for Balsamiq experts who can, try this list of resources.
We also don't have the resources to do live demonstrations or training, but we do have many demo videos and tutorials available on our web site. Some good places to visit are our Tutorials, the Balsamiq Wireframes for Desktop documentation, and the Balsamiq Cloud documentation.
We also published the following two online courses, which are great for beginners:
And if you ever run into problems, don't hesitate to contact us for help!