What legal database for researching cases seems to be the best to use?

start with something simple:
ask a question in google.com
what is cause of action?
this will give many legal resources.
another simple approach is www.justia.com

This course offers legal resources ... try that.

Clearly identify for yourself what exactly you are looking for such as what cause of action best relates to your case.

Another approach is do you know the statute which applies to your case/cause of action ... in your state jurisdiction.

as a newbe this is all pretty foggy ... just keep going until you find your answer.