Good question because it brings up the business part of your "mastering." Like any job that an employer desires to fill and a potential employee desires to have, the work description like the wages are negotiated and the final negotiated agreement is written into a contract. Or not. That contract is part of the negotiation.
The more salient question is first, "What do you want to sell?" When you are clear about this, you can move onto deciding how and when do you want to be paid and for how long? For example, you mentioned "renting" in your question. Rent is paid in advance and I recommend this. The qualifying party is an administrative position that establishes whether the company will be in business or not in the same way that the place of business establishes the business.
If the business is small or you want to work for foreman wages and work with your tools on, or not, this is part of the negotiation. If the company is larger, then maybe they want you to provide work that is done from a desk. The whole agreement pivots on what you are selling and what they want to buy.