If you have more than one issue, research them individually.
Double check your work in all sources to be sure you have not missed anything.
Keep a good record of your research. (List what you find and where you found it.)
Cases at each level of the court system are published in their own separate reporter, so keep the level of court in mind when doing your research.
Primary vs Secondary Sources
A primary sources is the law, whereas secondary sources are about the law.
Secondary sources will lead you to primary sources and save you time.
Secondary sources may lead you to relevant cases and also help identify controlling statutes.