retired @45 yrs.old wants to visit shanghai

yes,i am 45 & retired. first time to visit mainland china. i have travelled extensively around asia like Taiwan,Hong kong, macau, singapore, vietnam, malaysia. I don't own a business, but i do have a bank deposit, time deposit and owns a piece of lot. my younger brother is sponsoring my trip to China. Can my brother give a letter of proof that he will provide my trip? can he write it in Chinese? what documents should my brother provide to the embassy?