What document is needed for a private person to make a website for a legal entity?

Question

Computer networks

An individual offers his services to create websites, a legal entity approaches him to make a website for him. What can a private person give from himself? In terms of documents? Maybe a sheet with completed tasks and a signature?

Answer 1

a contract can be signed by a person and an act

Answer 2

You can contract for the provision of services. After the work is completed - an act of work performed.
A tax agent is a legal entity.
The execution plan is also written in terms of deadlines, etc., the task according to which the legal entity should receive this or that site.

Answer 3

An agreement is being drawn up.