Howdy,
First Happy Thanksgiving everyone

Second of all, I have a question.
I have a small computer business. I fix and service computers around NYC. I want to try to get some contracts with local businesses, so I want to look nice...
Unfortunately, I know close to nothing about looking nice. I am 17 years old, still in high school. I never really payed attention to clothing. Mom bought all of it

and it is well...not business-like...
I want to go to a few thrift stores this Black Friday and pick out $50-$80 worth of nice business clothing. Something that will make me look presentable to clients.
So far here's my list:
- White shirts
- Suit
- Black Pants
- Tie
- Shoes (this I really need help on...what do good business shoes look like?)
- Belt (will any belt do?)
Also are those hats still part of business attire?

Now I know absolutely nothing about how to dress business-like and really need some pointers. What brands should I go for, what styles, what accessories, what looks "professional"? If you were a small business owner what clothing would you look for in a tech support guy...