I agree with the advice not to get a TB.
They can be brilliant horses are generally are pretty good on the ground, and have seen plenty of life but they are hard to manage well.
While they aren't all high energy buzzy types they can quickly get a bit full of themselves which can be intimidating for a novice.
The main thing is that they are sensitive and delicate and bred for one very specific purpose. So you need to expect things like mud fever, gastric ulcers, poor feet, sugar sensitivity, kissing spines, excess wear and tear, one-sidedness, stable vices, sensitive skin, fine coats and a metabolism that means even with huge feeds they look ribby.
They don't all have all of the issues, and many can be managed and eventually make good riding horses but they need careful management which is an extra learning curve. I look at the ones I know and it is really noticeable how much more high maintenance they are than my fairly high maintenance little sport horse.
Unless you are buying an older TB out of training for years and already doing well in a private home that is known to you I would steer clear.