I need to find articles on psalms, different types of psalms...
You can find a good, lengthy overview of psalms on Catholic Encyclopedia online.
For article searches, select Academic Search Premier from the Databases A-Z page. Above the search box, click the link to 'Choose Databases.' Keep Academic Search Premier checked, and also check the boxes next to ATLA Catholic and Periodical Literature Index, ATLA Religion Database with ATLASerials, and Literary Reference Center. In the search box type in psalms (or types of psalms, etc.).
To find books, select the Books & DVDs bar on the Quick Search Menu on the library home page. In the CoolCat search box, type psalms, change Keywords anywhere to Keywords in Subject, and select 'Limit to CSE Library'. This search will lead you to a number of books on psalms. Take down the call number of any books you might be interested in, and locate them on the upper level, right wing (near Academic Skills).