There are many different factors in selecting the shop that you want to work in. Not every shop is equal, and not every shop is safe to work in. Here are some key factors to look at when you are applying for your first machining job:
The age of the equipment
Mist collection systems on the machines to capture coolant and oil mists
Climate controlled environment
Do they machine hazardous material like beryllium copper?
The benefits package
Will they invest in you and train you?