hmm, i'll revise some of your research questions, i hope these may help you.
1. Do you think you need a nursing tutorial center?
i think its much better if you will say "what can we benefit from engaging into a nursing tutorial center? its pros and cons?" rather than the question you have. also you would start on what nursing tutorial services is all about, make a definition out of it..
2. What subjects in nursing do you usually need help in?
hmm, you can put in "what particular subjects...". make your question specific so that it is clearer to answer..
3. Also, are you having a hard time trying to find speakers for your seminars?
yes, this question is correct.
hope these may help you in formulating your research study.