For your specific assignment of comparing two economic systems begin with a clear definition of each system by using a real encyclopedia such as Funk & Wagnalls.
From the abstract but very detailed definitions in the encyclopedia, now think about a country where capitalism or communism has been adopted. If you are not sure where, Try a search for the word "Communist" in CountryWatch or Country Background Notes.
Now if you have a specific country in mind, look further in those two country database or move over to Academic Search Complete.
The essential applied research skills can be learned in this guide in approximately 100 minutes. Downloadable PDF handouts are included.
This Libguide is presented in 4 sections:
Consider “library databases” as the primary tool that you use.
Out of habit you may want to start to orientate yourself with a search in Google. If you do, conduct a domain-limited Google search to filter out poor quality sources.
Make use of the Library Research Assistance Service (Reference Service)