I don't know if this is the best place to ask this question, but I couldn't find another stackexchange site to ask it.
I am a computer engineering student that doesn't work anywhere, and I don't have a company as well. I decided to develop an android application for a famous person in my country. We talked a few times on phone, tomorrow I will go to the city that he lives to show demo application and get an agreement about details, such as price etc. Getting agreement is quite important because, he may be a great reference.
I want to look like professional, because that will obviously increase my chance on getting an agreement. So, I decided to make a small presentation about application. But the problem is, he already knows that I'm still a student, and I'm not a professional yet. For my case, instead of being an advantage, creating a presentation may be a disadvantage.
Do you think presentation is an advantage or disadvantage in these kind of cases?
Edit: Thanks a lot for all the answers. I did a small (6-7 pages) power point presentation, and I can easily say, it impressed the client a lot, and we made a deal.