BMJ published a series of articles on doing questionnaire-based research in 2004 (first 3 links). They are short, but useful. The rest of the links are additional articles, sites, and tutorials.
Book about Nursing Research, such as handbooks and guides, are available at the RT81.5 call number range in the library (in print and online) and under the Subject Heading "Nursing Research -- Methodology". A few selected resources are below:
Routledge International Handbook of Qualitative Nursing Research (print)
by
Cheryl Tatano Beck (Editor)
Statistics and Data Analysis for Nursing Research (print)
by
Denise F. Polit; Eileen Lake
E-Source (online book)
by
Office of Behavioral & Social Sciences Research
Nursing Research: Reading, Using and Creating Evidence (print)
by
Janet Houser