What documents need to be drawn up when selling a team for outsourcing for China?

Question

Outsourcing

Good afternoon, we have our own small team. Registered as sole proprietorship.. Recently, a representative of China appeared, who, after the meeting, wanted to buy 80 percent of the shares.. He speaks Russian very badly and I could not explain to him how we are formalized and that we are not a company, but a team ... Now I want to how to explain to him that we have a team and we are ready to work on Outsourcing, without selling shares .. which we don’t have)). Tell me what should I do in this situation? ... This is a good chance to get outsourcing, but I don’t want to shed it because I didn’t register as an LLC or something like that.