First of all, you should know the index and price of coal. It is best to register a company. If you don't want to register a company, you can find a coal company to hang a card. Generally, many customers who want coal are state-owned enterprises, and you are required to have all the certificates of your company. If it is an individual, it will be less.
Secondly, register your coal sales information online and search some good websites, such as Coal Information Network, China Coal Network and Coal Network. Step by step. Good luck.