I don't know how to save the sketch and in what older as the software doesn't recognize the folder
Please provide more details. It's difficult to understand exactly what the problem is you're having based on so little information.
If you're getting any error messages, please post the full and exact text of the error messages.
Get the Arduino cookbook by Michael Margolis and read it. Also on line there are many videos etc showing the Arduino and how to do what you want. This additional information will go a long way in getting your problem solved. Once you get past this you then need to select your sensors and actuators. At that point you start on the hardware design and write your software.