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Anyone in the field you are interested in will be able to give you good information about that field. Someone who has significant experience in the field will be able to give you excellent oversight into how the field has changed and future industry changes. However, it is also really important to talk to the youngest people you can find who are doing jobs that interest you the most. After all you want to find out what it is like at the entry level, how they got into the field and what they would recommend you learn to make your CV competitive.

The best idea is to interview people at their place of work - this gives you a chance to observe the working environment at the same time. (Does it match with elements you would have picked for your ideal work environment?)

To get an information interview you will need to email or phone and ask to speak to a worker doing the job that interests you. It's a good idea to write out what you would like to request to ensure that you convey your request clearly. This is often called a "pitch". For example:

"Hi my name is Evan.

My mother gave me your name because you work in an architectural firm.

I am very interested in design technology at school and I'm thinking of pursuing a career as an architect.

I would appreciate the chance to talk to you and people within your firm to learn more about the field and what being and architect involves.

Could I make an appointment to talk with you about your work?

I would need about 15 minutes of your time."

You should have some questions prepared and take a pen and notebook to write down notes. You do not need to take a resume (in fact if you do it changes the nature of your interview) BUT you should be prepared to talk about yourself in conversation.

It's important to follow-up the interviews with a thank you note. Whenever you meet with someone they are giving you something valuable - their time and the benefit of their experience. This deserves to be acknowledged.