we had a 24x40 pole barn built and we want to run a 200 amp electrical box the electrical company will hook up to it what do I need from the inside?

What exactly are you asking? Do you need every last detail and material item explained?

What experience do you have?

You should check with your power company first and make sure you have every thing right. They will usually give you a spec sheet that gives you the details. Usually a 200amp service panel with a main disconnect breaker inside connected via conduit to a meter base on the outside. And grounded to a ground rod driven into the ground very close to the panel. If you don't have experience in this type of work, you should really have this work done by a lic. Electrician. I would think that your power company and local gov. would require this work be done by a lic. Electrician.