Data analysis and statistics

I have a scientific research project with about 500 participants - 22 questions pre vs post (44 total answers) results for analysis and statistical values. The worksheet is currently in xls. There are no personal identifiers.
I would want mean age, gender count, results of research, and statistics. Please advise time to complete, method and your fee. I put in $100 not because that is what I will pay, just to get this posted.