Acknowledgements are basically thank yous to people who have contributed to, or helped you with research or insights to your paper or project.
A couple of good starters for you could be:
I would like to thank the following people for helping me in the completion of this project. Without them it wouldn't have been possible. (And then list the people who helped and how they helped) IE: Anna Smith for her valuable interviews. Fred Hanson for his proofreading skills...
The authors wish to thank ______________ for her valuable insights, and ______________for making data available to me, and _________________ for the funding that made this project possible.
Use courtesy titles like Dr. or Professor as this should be a rather formal acknowledgement of help received.