First, best wishes on your efforts to enter ag production. Second, this project will help you think through some important business concepts that will carry you through in future years. Start small, do not grow faster than you can financially handle and discover your level of risk aversion. Rarely does a "go for broke" strategy succeed, the only one that is broke is you. But learning to handle risk and your level of acceptable risk is important. Sometime it's a gut instinct that works well for you. Sometimes, it's learning from experience and being able to gather the facts and learn from them.
I also understand some of the reasons why you want to enter the cattle business. Historical evidence, however indicates a low level of returns, unless you have a niche market that is underserved or you have an opportunity in the future to carry the enterprise from conception to slaughter or dinner plate. Let this experience teach you important lessons. Observe, question, never accept things at face value but work to learn the fundamental principles of the business and it will help you. Glean from the experiences of those you respect that are role models, from your parents and others in the community.
I know that I had a hard time getting my first loan of 30,000 after college. at 17 If he does get it I hope he puts up the bank and the bankers name. 
