You will find your problem is too big as in multifaceted for a start for anyone being able to help you.
- you need to have your Arduino up and running and sending the desired values. (Arduino questions should be posted on an Arduino forum.)
- create things (and if you are new to openHAB, please start with the documentation: Introduction | openHAB)
- create items
- potentially create rules
- create the sitemap to show the values
What have you done so far?
What is your current set-up?
What is not working?
What have you tried?
And you may want to read this first: How to ask a good question / Help Us Help You