Hi Alba,
Andrea gave you some good advice, what I would add to that is to take this valuable time (you won't always have it) after clients find out what a great VA you are!. Put it to good use. I always have an online course going on, or two, or three, plus self-studying.
I am a constant buyer at Amazon. Is there anything that you need to do for clients in the way of contracts, welcome kits, or marketing materials. This is the time while you have yet to be found. Don't forget to leave time for valuable networking (this is how most clients are found), both online and in person. HTH