I am looking for guidance on how to locate 12-15 sources for a research proposal

I am looking for guidance on how to locate 12-15 sources for a research proposal outline that addresses the effects of counseling in an adverse work culture. In addition, I need further guidance with a literature review, and a methodology/action plan. I must be able to pull at least 10 of the articles if i log into the school’s databases. The attachment shows areas I need guidance on.