Every person has a different story for how they got to where they are in broadcasting. There truly is no one path.
For me, I knew when I was young that I wanted to make my job in sports broadcasting. I got involved in high school doing play-by-play for my team's games and hosting radio talk shows when I could. I went to a college with a good broadcasting program. In addition to journalism course work, got involved with school TV & radio clubs doing as much sports as I could.
After graduation, it took a couple years for me to get my first on-air job. The first one is always the toughest! I was the main sports anchor in Casper, Wyoming. Often times, you have to be willing to start in very small city where the entry level jobs are. If you are not, you are making a really tough profession that much tougher. I always tell people who want to be on-air not to say no to basically any job. You never known when (or if) another offer will come.
I spent 2.5 years in Wyoming, then 2 more years in a small market in Texas before getting a major break and getting a job in Boston. As long as you truly love the job of being a sports anchor/reporter though, it should not matter where you are. Sure, you will want to stay ambitious and improve your job, but if you don't fundamentally love the job, it makes it almost impossible to stick with it long term