Which design pattern to follow?

I need to create an application which will read csv and do lot of manipulation and finally load the data into some target Oracle cloud application. 1.)There will be various source applications. In main method, we will supply source application name and depending on source application name, it will read properties file for that particular source application and load all values like source folder name, source file name etc. There are more than 20 source applications and hence 20+. Properties file. Which design pattern to follow to implement this. 2.) series of operations are called to process file and upload to target like-file read, file validation check, file manipulation, file upload, file upload status check etc. Which design pattern will be best to implement this kind of functionality. Thanks, Pooja Gupta