Don't worry about being particularly prepared for the consultation. All you need is to make the initial phone call, email, or online appointment. Once you have your consultation appointment, the therapist will take the lead. Personally, I'll ask about what has been going on for you lately, how long this has been a concern, and what you types of goals you have. Plenty often clients don't know their goals right away, so we can spend time in the first few sessions identifying what will be different when the presenting problem is gone or better managed.
In this consultation, we are able to assess whether our therapy is likely to be right for you. If not, we can help link you with more appropriate resources. This might mean a different type of mental health (such as me referring to a clinic for those that aren't Skype-appropriate) or to community resources, like recreation centers, town supports, and self-help groups.
So, the most important message is, try not to stress yourself with expectations for the consultation. You don't have to direct the conversations, just answer questions to the best of your knowledge. Don't worry about if some of your answers are "I don't know." And don't worry if your answers aren't the most eloquent, we understand!