Never tell your first few clients that they are your first few unless they ask (which they won't if you handle yourself and your business well)! Everyone wants to deal with a business that has experience but nobody wants to take the risk of being the one to give the business that experience. On top of that, your inexperience will not only make you look incompetent, but it will make them think they can take advantage of you by haggling or scamming you (yes, clients can scam).