You will apply in person. Go to the head office. Talk to human resources first and have a mini interview with them. Afterwards you will have an interview with a supervisor. If that goes well you will then have a final interview with the operations manager, president of the company and possibly the owner of the company. After all of your interviews are done you will take a drug test and upon completion of that then will attend training to receive any certifications you will need for the oilfield.