tiens have a sale permotion in pakistan what is the required docoument+ when to apply for visa

Tiens(Global Network Marketing Company) have a sales per motion in our country and while we achieve the sales target in June 2012 they will arrange our two way air tickets and accommodation in china. I have read your policy but still do not understand how i could provide the detail. Also do not understand what is the requirement of your embassy and when to apply for the visa