Affiliate Marketing Secrets

I’ve started like, five or six equestrian centers on the Howrse.com game, and they always fail (I run out of money). I try to be careful about what I buy but just getting the necessities run me down to below 1,000 Equus! I can’t buy passes or anything, so I can’t get the big meadows or other things from the Secret Market …
Basically I’m looking for some tips on how to run my equestrian center cheaply, and make some money too, instead of just spending it all and ending up with a crappy center, which is what usually happens.