You have to hire a Saddler.
A western saddle and bridle. andalina
You can only sell the bridle it you haven't moved it to your tack room.
there isn't one
You don't buy horseshoes for your equestrain centre on howrse. Instead, go to employees and hire a farrier. Do the same if you want a saddle and bridle, hire a saddler.
Athena's Bridle is part of the Atalante Pack. If you want Athena's Bridle you have to buy the pack, which costs 3 passes.
Buy them at the shop by clicking on the bridle tab when in the shop
A Bitless Bridle, (also known an a hackamore, or sometimes bosal for some people)
Athena's Bridle
Yes, you do. And a bridle and horseshoes if you want to enter a competition too.
You have to hire a saddler for a saddle and bridle, and a farrier for horseshoes.
I don't think there is such a thing as a breeders center on Howrse...
Bridle path