How can we create a scheduler (batch job) in Appian, which will run on schedule

Scheduling a process to start on a specific schedule can be done with the start event timer.

forum.appian.com/.../Start_Event:_Timer

To get a file from a share location and then process the data in the file there are multiple options depending on what kind of file/data you need to process and what methods are available to get the file. If you have more details on the file type and potential options to get the file someone can probably point you in the right direction.