Any lawyer needs to be a good problem-solver, and have a firm understanding of logic, as well as logical fallacies. With the complexities and personal-ness of labor issues, ability to gain a client's trust and listen carefully to all the information will also be very important. All lawyers should be comfortable with public speaking, as well.
You need a lawyer skilled in labor and employment law. There are intricacies to federal and state statutes governing emloyment that a general personal injury lawyer might not know as readily as an employment lawyer.
Law firm; courtroom would be great starts
To become a labor law lawyer you will need to get a bachelor's and Juris Doctor degree. After this you must join the Bar (an organization of lawyers).
None. You have to have a law degree and pass the bar exam.
proving points competitivness disputing a hobo slave
Any really, but the more complex the instrument the greater the skill needed to play it well.
skill in one kind work
It depends what kind of lawyer you are studying to be.
Skills needed to perform a certain kind of job.
contractual lawyer
"That depends on what kind of lawyer you need. The best way to find a lawyer, is to find a referral service and call them and tell them what kind of budget you have and what kind of lawyer you need."
There isn't one, depending on what kind of business it is, it's just that child labor laws may apply. Consult with a lawyer for more information.