Learning how to do library research is a skill that takes practice just like anything worth learning. If you're feeling frustrated, you're on the right track!
To learn more about how to be a good researcher, start with the CTU Library Guide. Check out the Research Process pages to learn more about each step.
There's more tips and suggestions on the Writing Support Center's Conducting Library Research page.
Asking for help is always a good idea. Contact the library to ask specific questions.