The following book is recommended to give you an overall picture of conducting clinical research.
Gallin, J. I., Ognibene, F. P. (2012). Principles and Practice of Clinical Research. 797 pages, Elsevier Science.
This book is available in full text as an eBook in eLibrary of the University.
Supino, P.G., Borer, J.S. (2012) Principles of research methodology: a guide for clinical investigators. 285 pages. Springer. New York.