China visa for bussiness

Dear Sirs,

It is nice to contact you , Please I want to get visa to visit a manufacturer in China , I have a sample of invitation from them , but I need to know:
1- where can I apply to get it in Baghdad ?
2- how many days you will it take?
3- Can I come to your embassy to apply and get it ?
4- Please If you can send mobile No. for a person who is responsible for such as my case to talk with him?
5- Can I full the form you are putting it in this site by myself and come to your embassy?

Thank you for your time and best regards