Just put your best work in there, show that you can work for a client without imposing your own style on everything and make sure you have a little backstory by your different pieces or work, which shows that you know what to expect from a job like that. If you can tell what had to be done (in what time frame) and with which objective, you can 'color' the pieces of work, to make them more interesting. I have made a lot of brochures that took a lot of time and negotiating, while the end results looks very natural and simple (that was the negotiating for). When you tell a little about the process, you show experience. If there is nothing to tell, your work and attitude have to make clear what they can expect. One of the most important things is to not put stuff in your portfolio that you are not very happy with. If you think there is not enough in it, add some personal works, or just make clear you are pretty young (that's what they want), so you do not have years worth of work to show. If you have video stuff to show, keep it short, only 3 to 5 minutes maximum. Or make one short reel to look at while you are there and keep more material for further reference. Ask if they have a video player at hand or prefer a CD or DVD. Jus my 2 cents... Good luck!