I sort of just searched online or read old nursing material/books on psych. I did buy one psych book that was purely about medications.
Here are some medications that I give often and are worth reading up on: Seroquel, Zyprexa, Risperdal, Depakote, Cogentin, Zoloft, Lexapro, Prozac, Ambien, Ativan, Gabapentin, Haldol, Lithium, Cymbalta, Klonopin, Hydroxyzine (I never even seen this medication on med-surg but we give it a lot in osych), Lamictal, Trileptal, Abilify, Geodon, Celexa, Benadryl, Trazodone.
Some of the things we ask during our assessments: Are you suicidal? Homicidal? Hearing voices? Seeing things? Eating and sleeping well? Depression and rate it between 0-10, anxiety and rate it between 0-10, pain and rate it between 0-10. I usually ask if something in particular is making them anxious or depressed. If they are suicidal, we ask if they have a plan, if they will tell someone on staff if they plan to harm themselves, etc.
Brush up on some labs values: Lithium norm between 0.6 -1.2 (they drilled this into us in nursing school) Depakote 50 - 100/125. You'll want to keep an eye on a patient's WBC level if they are on Clozaril.
Read about therapeutic communication and de-escalation.