Horses are A LOT of responsibility. If something could happen, 9 times out of 10, it could. I agree, everyone starts somewhere, but, online research just doesn't cut it. Vet expenses are crazy no matter why - a simple fecal exam or bloodwork is normally $25. That's if you haul to the office, a farm call is even higher.
I was stubborn and young once but I had ridden, worked on farms during the summer, and had learned everything I knew from experienced trainers. My third horse was a "rescue" - a cute little red dun QH stud - but by that time I knew what I was doing. He had his own pasture, feeding regimen, training schedule, and he knew who was boss at all times until he was gelded(he wasn't fully dropped until he was 3).
Saddle fitting certain horses can be a pain. Do you know anyone/anywhere that will let you trial a saddle? The bridle must fit the horses head properly, as well as the right size bit.
Do you have a vet, dentist, farrier, etc lined up? Your horse will need all of them.
Will you be able to bale your own hay from your farm or will you be buying hay? If so, round or square? What type of feed will you be feeding?
There's a lot more than "oh I want this horse" to a horse!
Not being rude in the least but before you decide a horse is right for you, right now, check your local area for the cost of feed/hay, check out vets, & farriers. It will help in the long run.
Sit tall in the saddle, hold your head up high, keep your eyes fixed where the trail meets the sky, & live like you aint afraid to die, & don't be scared, just enjoy your ride.