I wanted to start cleaning business of my own because I have work as cleaning site Manager at some big shop over 10 years and i want to start my

I'll assume you mean getting work, your post never finished. Start knocking on doors, join a local business to business club, any way to get your name out.

I'm basing my answer on your title. Sounds like you have a registered company, but no business contracts. Start calling people and competing with other cleaning companies. The lowest bid wins the contract.

You will need to start going from business to business, talking to managers, maintenance supervisors, finding out when contracts come due, finding out what their bidding process is.

Sales is the magic to the business, so you will need to find hours and hours each week to start selling your service. Plus if you do not have sales experince, perhaps some training in sales.