Pfft, you only want to follow the Broncos because they've beasting at the moment! *bandwagon generalisation*
In all seriousness, watch the season first as a neutral. Watch as much as you can. At the end of the season chose the team that jumps out at you. It's what I did. I loved the way the Ravens played, and although we didn't get through the play-offs we played hard. I loved it, and ever since then I've loved them.