Do I start the conversation before I'm eligible for any calls? Until now I have not yet got any calls.
You need to do two things to get calls. First, optimize your profile so it is clean and professional. Make sure you have a picture of yourself and images to go with each expertise offering. Complete all parts of your profile so potential callers aren't turned away by an incomplete, haphazard appearance. After all, without any reviews, your profile content and images are all they have to go on. Read up on copywriting to understand how to make what you are presenting compelling.
Second, spread the word and get your name out there. Answers questions on here for topics you can help people with. Add a link back to your Clarity profile on anywhere you have a presence such as Facebook, Twitter, your website, email signature, etc. Also mention your Clarity profile when you help them with something too so they can follow-up and book a call.
If you need help with any of this, I'd be glad to chat further, just shoot me a message.
If you are asking yourself the question, then you probably know the answer.
It may work to start spamming people, but I really doubt it will. This is a service based on trust, referrals and knowledge.