Since you're not going to buy straight now, here's my advice: make as much experience as you can, visit different places (not just one barn), read, read and read more, so you can form your own opinion on many things.
In time you'll notice that there are very few things about horses that everyone agrees on. What to feed, what tack to use: just those two things can generate flaming fights between people who have very strong opinions about them. Multiply for everything.
What are the priorities when you own a horse? For some, priority is having a nice barn with a good instructor and a well kept arena, so they can train all year and be competitive at shows.
For some others top priority is having a bombproof horse that they can leave in the paddock and ride once in a month.
For some people number one priority is finding an instructor who teaches their favorite training method (if we talk about training methods, flaming fights don't begin to cover it, we may talk about wars…)
A lot of people learn to ride at just one barn, and they tend to take the instructor's word as a undeniable truth. This can be very good or very bad, depending on the instructor, but no instructor on earth knows the true truth of horse-keeping and training. They may have methods that work, and work well, but that doesn't mean that everything else is wrong.
That's why you should learn more: the bit is not just something that needs to be in the horse's mouth: there are reasons to use a bit, reasons to not use a bit, and different reasons to use different bits, and no reasons on earth to use some bits. Knowing the difference will help you when you'll have to decide what to buy for your horse. And this is just the bit. There is all the tack, and the place where the horse will live, and the way you'll ride him, and what farrier/vet/trainer to trust, and what to feed… and I haven't even started to talk about the different types of horses and which one can be the right one for you.
Sooo a lot of things to think about ;)