As Tyler pointed out in his comment, we are not going to do your homework for you. I'm going to ask some questions. It is important that you answer them for yourself. Giving the answers to us is secondary.
What is the audience supposed to take from your project? (I'm assuming that there will be some sort of presentation.)
- Ghettos existed long before the Holocaust. Nazis made use of pre-existing ethnic neighbourhoods for their purposes. There is a difference between a street where the Jews live and a closed ghetto.
- The ghetto system was part of the Nazi genocide. People were held in ghettos prior to their deportation to camps and they were killed in the ghettos, through systematic starvation and other means.
- The ghetto system held their inmates in locations where the labor force could be exploited.
- The ghettos had some degree of self-organization. This led to collaboration but also to organized resistance.
What should be mentioned, even if the audience probably won't remember the details?
- A map with dots for each ghetto.
- Different kinds of ghetto. Open, closed, extermination.
- Numbers. Total inmates, total deaths in ghettos, the size of the largest ghettos.
- The timeline how they fit into the Endlösung plans.
What skills are you supposed to learn and show with your project?
- Research. You want to show to your teachers that you can take a topic where you have no knowledge and find the relevant information from books, the internet, etc.
- Presentation. You want to show your teachers that you can present your results in a clear, concise manner.
Depending on your time for the preparation and for the presentation, you might not be able to cover all the bullet points, or you might add some more. If you have lots of time, you might ask a Jewish congregation in your neighbourhood if there are ghetto survivors still alive, but before you do that you should talk to your teachers.
TL;DR Warsaw. It was large, it shows deportation to and from ghettos, it fought.