Lost but found passport.

My passport got lost as soon I as got to China with a bussiness visa which had not expired by then. I reported to the police and I was given a police report because I had alredy registered for temporal residence permit. I have overstayed for 3 years and had just found my passport. I want to go home. How do I go home and will I pay a find of 10000rmb/more/less?......Please help me quickly! thanks.....