Lots of great advice from other OTTB owners.
My question is:
Have you rescued before?
I have rescued 3 or 4 horses in my life. I still have the Arab I rescued 19+ years ago. He was a starving horse poster child with an injured vertebra.
He still has health issues that go back to whatever happened to him before I came along.
Point-being, for anyone that's never rescued a horse that truly does need rescued, please be prepared for health issues to crop up over time and have extra money in the checkbook for the things you weren't planning on.
Nobody (including the great folks that run these rescue operations) can predict what the long-term ramifications of the initial abuse and/or neglect can be.
I have pumped a lot of $$$$ into my Arab that I know, for fact, are due to neglect and injuries when he was young. Over time, he got his self-esteem back to become the Passive Leader (second-in-command), still plays tricks on me, and still makes monkey faces when he's mad at me.
The one thing he can't do anymore is that beautiful-leave-alump-in-my-throat Arab float. Thanks to the arthritis from the vertebra injury he had when I rescued him over 19 years ago.
So unless you plan on not keeping this horse over the long haul, those are my thoughts on what you need to know about taking on a rescue - regardless of breed