If someone is in the US on a tourist visa and there is an employer that is ready to hire them. What would be the next steps to take?

This is possible, but it's a long drawn out process where the department of labor and the US CIS has to get involved and it has to be done in a two-stage process. He would need to get permission from the department of labor that there are no qualified workers in the United States that could fill the position. Once that is obtained he could change status. He Should retain counsel to process the case from start to finish.