If you are asking if there is one, then yes there is one.
Just look on the map after you unlock horse breaking jobs.
(You unlock them after Bonnie gives you the Lasso, and when you finish the mission she gives it to you)
There are horse breaking jobs available to complete in Red Dead Redemption, but not at the MacFarlane's Ranch. There is a horse breaking job available at Ridgewood Farm and Chuparosa. There is also a story line mission call "Wild Horses, Tamed Passions" that involves breaking horses for the MacFarlanes, it is available at the beginning of the game. This is also were you acquire a lasso from Bonnie MacFarlane, you use this to hold the horses still while to mount them to break.
On the newspapers that you can buy at Mac Farlanes ranch and in other towns.
You can do missions for Bonnie MacFarlane in Red Dead Redemption, that is all.
Do your missions.
do your missions
yes
on the storyline there is 51 missions and 18 side missions
No, in undead nightmare you basically kill zombies and do zombie missions
you have to do missions
do the missions which it says in your journal
there are no proper missions but there are mini missions such as killing the man who killed John
there is no cheat for it, you must do the missions for it in your journal
you must do more missions until it unlocks