Here are some useful links which provide sample scripts for talking to your clients about depression, alcohol use and drug use, and a script for doing motivational interviewing.
This link below has documents regarding talking about depression, ways to screen for intention for suicide, and educating clients about depression
http://mncm.org/wp-content/uploads/2014/09/HelpandHealing_Sec1_All.pdf
This link below is an alcohol screening and brief intervention guide
http://www.integration.samhsa.gov/clinical-practice/alcohol_screening_and_brief_interventions_a_guide_for_public_health_practitioners.pdf
Here is a sample script for doing motivational interviewing. Very useful for begining interns
http://healthteamworks.ebizcdn.com/298f95e1bf9136124592c8d4825a06fc
For more such useful resources do visit the SAMHSA-HRSA center for integrated Health solutions –
http://www.integration.samhsa.gov/clinical-practice/screening-tools