I would add, look for a project about something that interests you. Don't do it just to fulfill and assignment. Do it so you learn something you didn't know about something you have an interest in. That will make you smarter in the long run.
I think i would probably suggest you to go for a topic related with environment. With the ecological imbalance creeping in the whole world, it is important to spread awareness amongst every individual about the imbalance created by human beings.
Well I would do something your child doesn't know very much about. Like does it matter what type of light a plant needs. Then they will know more about that subject. I hope this helps. I looked on the website below and it helped