re: Is there anything that I should know before trade school?

There's going to be alot of different types of folks there. Good, bad, positive, negative, and everything in between. Don't get caught up in any noise and BS from the wrong people, go to class and focus on what you need to learn, and once you're out find a good mentor once you get into the field.

The trenches are not a glorious place but stay committed to your trade, show up to work on time, and learn everyday. If you do that for 10 years the rest of your career will be taken care of.

A good tradesman in ANY field is gold nowadays.