You can proceed with the dissertation, just make sure that you properly phrase the research hypotheses and objectives because the research objectives are not proper research objectives.
For the research methodology, review the chapter on selecting and writing research methodology including sampling procedure and the calculation of sample size.
The listed objectives relate to the process of conducting the research, for example the mixed method is a process not an outcome. Research objectives are the goals that will be achieved by conducting the research. For example, the best leadership style for sales department,…etc.
Please read the recommended chapters from the book and review published research.