Texas Applicators License

I'm pretty new here so bare with me. This may have been mentioned here at some point or another. I'm tired of spending the money to get my field fertilized. I have a hay field with coastal bermuda I harvest every year. I would love to save money and start fertilizing the field. I'm a little confused on which license I need since there are several options... commercial, non-commercial, private. Any recommendations on a good site and which option to choose? And yes, the hay is baled and sold.

Texas Applicators License