First of all you should be able to determine your need. For example, sometimes a labour law attorney is enough to plead and fight your case but in some cases you might need an attorney who has knowledge of some other fields, i.e. welfare etc, and knowing only labour laws might not be enough in success chances of your case.
Start with searching for a right attorney for yourself from your local court's bar. They have generally attorneys on their lists offering their legal services on different conditions. If they do not have any attorney available or they do not know of one, they can refer you to a right person or agency that can arrange an attorney for you.
You can also search online about the availability of labour law attorneys in your area and can approach them over the phone to get an appointment to discuss your matter. You can also contact through email and then arrange date and time for meeting.
Legal diaries and directors are other resources for you to search for a labour law attorney. Generally individual lawyers and law firms advertise in these resources every year and you can easily find their telephone numbers and other contact details. You can select an attorney and then discuss your case in person.
Once you have found an attorney, seek an appointment to discuss your case and also other matters, the most important one how much the attorney is going to charge for their services. You should give a consideration to money but sometimes a competent attorney is very expensive. However, it depends on your case also. Some lawyers might even refuse to take your case, or charge higher since it involves too many implications.
You can also avail any offer from a particular attorney. For example, if the case involves some compensation money and the attorney asks you to fight the case on no-win-no-fee basis, requiring a certain percentage of the money on winning the case, it is better you go for that option. This will not affect you because if the attorney loses the case, you do not have to pay any fee, and on the other hand, in such cases attorneys work harder to make sure they win and get the agreed amount.