An informational interview is isn't like a job interview. It's more of just a chat with someone working in the type of job you want to get in to. You could ask about the industry, and how people get in to it. You'll also make a new contact who might be able to help you in the future.
Start by researching employers you’d like to work for. Be as specific as possible. Use tools like LinkedIn to find names of people in jobs you're interested in.
Contact them and ask if they'd be willing to meet you to discuss their role.
When you’re going to your meeting, dress smart and make sure you’re punctual. Bring a list of things you know you want to ask about.
After your chat, send a thank-you note or email. Keep in touch and let them know how you’re getting on. Ask them to keep you in mind if anything comes up.