Could you help me find some articles with information about the positive effects of childhood competition?
There is a research guide for your course (SPCM 101) that should help you with this research. It's located at: http://libguides.usd.edu/SPCM101. There is a page of general-purpose databases that you could use to start your research. I'd suggest that you search under "competition" and "children" and "benefits."
If you try to search the databases in the research guide and continue to have difficulties, please call the reference desk at 605-677-6085. A librarian can help you in person with your searching.