Use these websites to create the basis of your assignment.
The following are publications in a series called Commentary on the United Nations Convention on the Rights of the Child. Click on the link, login and you will be able to view the text.
Look here for more:
Some journals have special issues considering the Convention on the Rights of the Child.
Here's a couple of examples:
The following databases should also give you articles that are relevant. Taylor & Francis have a lot of articles that say "Buy Now" but if you look a bit further you should be able to find enough journal articles "full access" that are available immediately to help you with your research.