Prepare a written job description, so you can refer to it frequently. When you publicize your job opening, spell out exactly what you want. Suppose you're looking for a sales clerk. There are many sources of promising applicants. Use the state employment service.
Newspaper advertising comes first to mind.
This can draw a number of written applicants that you can screen on your own schedule, and select only the more promising applicants for interviews. Sioux City's chapter has some 40 business experts available to provide free and confidential counseling on every phase of a small business operation.