I second what NancyM has said. I am not entirely experienced at the track however I did spend two summer seasons as a groom. I would highly recommend, if you could, spending time on the backside as a groom or other. You figure out in time who the good trainers are, who to stay away from, what to look for in horses, what to expect as far as costs go and how each trainer works, etc. I cannot recommend partnerships because you likely would have very little say, however I admit to my overall lack of knowledge in that aspect. Having spent some time on the track, here is how I would do it, personally (this is actually what we are considering doing in a few years, after hopefully purchasing our place this summer):
Purchase a promising, but economical yearling. You’ve got the place to keep and feed it, and it would be more economical than buying a 2yo. On the other hand, it could pay to purchase a 2yo who is showing promise as well. What the seller says though and what word is on the backside - what the riders and grooms think of the horse based on their experiences, could differ though (hence the leg up if you’ve got contacts on the backside). If you can do your own ‘starting’ at home, you reduce time the horse is on the track when it first starts out, and you eliminate needing a trainer to start your horse prior to its arrival on the track (everyone does it differently). Vet costs should not be high, but that depends on the trainer - what one trainer deems ‘necessary’ might not be what is necessary in your books (the trainer I worked for was very easy on the vet and only used the vet/others as required, when necessary, and based upon the owner’s input when the owner knew what they were doing). You definitely have an advantage having your own skillset and facilities, but it is still going to be costly. The only way to truly assess how costly, IMO, is to spend time on the backside and get to know some of the trainers. If you are absolutely set on a stakes or allowance horse though, you are looking at investing a lot of money. Once again, befriending people on the backside, who are studying the races, will help you figure out who’s hot and up-and-coming, and who isn’t. Don’t bank on a horse being a stakes or allowance horse, and do not bank on making any money. Just hope to break even if you do it smartly, and with the right sources/resources. I would highly recommend just starting out small. Make friends!!!