I never use the bonuses they are for the paying ppl i think. Everyone gets aging points every so often. to get to the store, put the mouse over "my breeding farm" which looks like a pic of a horse, a bunch of little icons should pop up under it, scroll to the right until you see a icon labeled "the store". It might not let you in there if you arent the right riding level. You can sell horse poop to the shop keeper to get a few bucks.
As for a job, i never found one as a groom, so its ok. you just dont make any money until your next riding level.
Hope this helps some of yall, let me know if yall got anymore q's.

"Give a horse your heart, and they will give you their soul in return"