What are some of the best ways to make money?

Do you have upgrades?  If so!  Sell your tickets & private shows!  Don't forget to make public shows as well...  every time someone enters the entry fee goes to your bank.

Can you  make graphics or code?  If so, try selling your items in the graphic auctions.

Do you have RL money to spend?  If so, try selling a couple upgrades in the upgrade auctions. (if you are doing this one I would love to buy a couple from you)

If you have extra time, try offering training, or other random tasks/services on HP.  Some players will pay you to transfer animals to different accounts or to organize their retirement etc.

Collect your bank money each week

Also, check out this from the help page: http://horsephenomena.com/help/getting_started.php#makemoney

And make your public shows each week :). When people enter, you will get money. And you win money when your animals win points in shows!