This question is one of the hardest we receive, mostly because each persons path to agriculture can look very different.
Depending on where you are, your background and even your capabilities the answer to this question can differ greatly.
In order to be a rancher you need 3 things, land, animals and the will to work.
Land can be gotten many different ways, through family, you can purchase land, you can lease land, or you can be given land and animals are much the same way.
Ranches can be small or larger, but the most important skill will be the willingness to work and the willingness to learn. Dive into books, talk to those in the business and offer to help. Be willing to take a ranch hand job to see if you really like it, and of course always have fun.
Good luck to you and thank you for watching!