Best options?

Heyo it be your friendly neighbor back from the grave
Yeah, so Heidi bucked me off again and I am currently dealing with a bruised (very bruised) body. I can barely move at this point
Anyways
So for a while I've been thinking about the possibilities of getting my own horse. This really all started with Junior, who I still desperately want to buy, but the owner isn't selling so I can't really do much there. I keep on getting put on ten difderent horses in riding and can't really settle with one. The only two I've been able to get to know and gain respect from are Junior and Heidi (Junior and I work amazingly together; Heidi hates me and insists on trying to kill me). I really want a horse that I can just settle with and potentially compete with. Obviously I cannot do that without buying my own horse at this point.
If I were to buy a horse, I would in fact board it at a stable closer to me- the place I currently ride at is fourty-five minutes away and gas adds up and yeah I don't wanna pay to go out every day with that distance. There is a barn both me and my sister have ridden at about fifteen or so minutes from my place, and it's well-kept and I would gladly board a horse there. I've decided it would probably be a long while before I actually have money to buy a horse lol, but it would be nice to plan ahead so I'm not jumping in blindly. A lot of people around here like to sell very unhealthy horses for rediculous amounts, then won't give you a refund.
So, I do believe I want to do jumping. So I'd want a jumping horse. I've been getting into free-riding lately and generally would like to do that, then compete actual jumping when I can. I know Dutch Warmbloods are a pretty great breed for that... I'm kind of leaning towards that, but I'm also leaning towards Paint Horses. I guess it really depends on what's available.
Where I'm getting stuck the most is temperament and age. As most of you know I want to be a trainer, and I would prefer to get a green horse so that I can train it. I don't really trust horses trained by other people at this point (another reason why I would wait to get a horse rn). So I'm suspecting a semi-young horse. I deal with a lot of very stubborn and lazy ponies, so I dunno what a "good temperament" for a jumping horse would be. My sister did jumping and said they use a lot of hot horses (which I love lol) so obviously most likely that, but I also don't want a horse that has an issue with bucking or rearing like Heidi. Probably also another reason I'd prefer to train my own horse.
So... any tips/ideas from y'all about buying a horse? I'd be kinda skeptical just cause we've bought a horse before and that horse ended up having major health issues. We gave the horse back to the original owner, but she never gave us a refund :/ Any tips would be much apprciated ;P

Hey! 

Your best bet, beyond anything, would definitely get a PPE (pre-purchase exam) on - ANY - horse you choose to look into. Young, old, etc. If it's unbroke, then, that's not much of an issue, but even a green horse, definitely get a PPE. What I would do, if I were you, I would plan out your budget with a future horse - cost of board, farrier, feed, hay, bedding, etc etc - and start putting some money back every paycheck (if you work) - some towards the cost of the actual horse and some towards the upkeep of said horse. Always, always plan for emergencies when budgeting, just to be on the safe side. ;)

As far as horse breeds - quite literally any horse can jump, if it has the desire to do so. I see a lot of Quarter Horses, Appendix Quarter Horses, and Thoroughbreds around here jumping. I'm in Ohio, so, the breeds around here aren't very 'pricey' (like your Warmbloods), thus, the 'cheaper' breeds bought are the Thoroughbreds, Appendix, etc. I would just start your search completely open minded. There are going to be horses that catch your eye, there are going to be horses that you just scream no, and there are going to be horses that are somewhere in between.

100% go with your gut. My mare was given to me - I was lucky enough to have some 'connections' at the time. I tend to get nervous on new horses, no matter how much someone tells me that, hey, this is an awesome horse! I always get nervous. I was, to begin with, getting on my mare. Then, I sat in the saddle and instantly just a calm came over me. That's how I knew she was the one! ♥ She's the best thing that's ever happened to me!