A certficated Commercial Pilot is paid for services as a pilot, provided you meet the qualifications which apply to the type of operations you are doing. 

What can I do with a commercial certificate?    The following are things commercial pilots can do under part 91 - 

1. Local scenic flights within 25sm of departure airport. 
2. Ferry Flights 
3. Crop Dusting 
4. Banner Towing 
5. Aerial Photography 
6. Fire fighting
7. Go on to earn your flight instructor certificate.

Prerequisites:

• 18 years of Age
• Class 2 Medical Exam
• 250 Hours Logged