I am a novice at Visual Basic. I can use either Excel 2010 or Excel 2013 for this task.
I have dozens of workbooks with data on the first worksheet of each. For exam
In Excel press Alt+F11, this will open the Excel VBA editor.
Article http://www.excel-spreadsheet.com/vba/debugging.htm explains some basics how to use it.
In Module1 there are 2 short subroutines opensheets and merge containing ~50 lines of code.
Use F1 with cursor within words you don't understand, to learn what it means.
Once you understand what the code does, you can tailor it to your needs.