The following databases provide access to journal articles from many disciplines. I recommend trying out these databases first. See what comes up and then change your search tactics accordingly.
The following databases are very specific to certain subjects. Once you have an idea of your paper topic, try searching in these databases but if you don't find what you are looking for, don't fret! Try the broader databases as well (see above).
Use the following sources if you want historical background on any given topic.