When choosing a school, I looked at distance and programs offered. Some schools offered more hours than required. One might be easily persuaded that this means more education, which I guess could be true. But more likely, it's just more money in the school's pocket. I called several schools. I ultimately chose the one that was farthest from me, simply because they had awesome customer service.
Now I can say that my main teacher was a very sweet older lady and I'll never forget her lessons. The school had issues, but I think that might be the case anywhere you go.
Don't expect to learn everything you need to know from school. School is a great place to start. But 99% of what you learn is from experience.
Continuing education is where you'll learn the majority of your skill. And PRACTICE PRACTICE PRACTICE.
Don't be afraid to try new things, but if you do them, do them with passion. If there's something you don't enjoy doing, listen to your heart and don't. You'll excel in what you're passionate about. For years I tried to convince myself I wanted to do acrylic. But truth be known, I just enjoy playing with it. The filing and rebalancing are of no interest to me. And that's ok. There are plenty of awesome techs who excel at acrylic enhancements.
Be true to yourself. Be humble, but know your worth. If in the future you work somewhere that isn't the right fit, don't be afraid to change it. And later in your career, if you need to take a hiatus, that's ok too.
Don't go gung ho over every new product to hit the market. (This is especially true if you're a product junkie like me.) Read reviews first, and YouTube it, if available.
Don't give up. If you're trying something new and can't get it to work, keep plugging away at it.
Stay thirsty for knowledge. Subscribe to nail magazines. Connect on social media to nail gurus you admire.
I hope this helps, and good luck!