VBA Q(s), a composite task mainly regarding External workbooks

[Cats and Dogs]

​Hi all,
First post. I do hope that I'm complying with the norms and terms and that my question is clear and not overly complicated.

That out of the way... I'm clearly a beginner, using office 2010, tasked with (and so far failing miserably at) putting together some code for my new position. I need help in achieving the following:

I have 3 external workbooks ExtWB-Anne.xlsx, ExtWB-Bonnie.xlsx, ExtWB-Chloe.xlsx and a master workbook MstrWB.xlsm in the folder (C:\Path).
In the ExtWB-A.xlsx, ExtWB-B.xlsx and ExtWB-C.xlsx corresponding to workers Ann, Bonnie and Chloe- I have payroll protected sheets divided by months: August 2015 and onwards.
I'm trying to pull the data into the master wb from the external wbs, according to both month and whether that employee is registered as working that month.

If I have it correctly I need to:
0. Trigger action on Open or Sheet change of MstrWB.xlsm.
1. Scan the folder in which the external workbooks are present.
2. Extract data only from the relevant files for those employees that have worked in the period of time as specified in MstrWB.xlsm, so that if for example Bonnie is missing from October's roster, that data will be left out (I was thinking that perhaps using an INDIRECT reference that pulls the roster from the relevant monthly worksheet in MstrWB.xlsm)
2a. Copy the the relevant monthly sheet from that external workbook corresponding to the correct month on MstrWB.xlsm (again, perhaps using an INDIRECT reference).
2b."Unprotect" each protected workbook (password:"password").
3. Paste data in MstrWB.xlsm.
4. Close the external workbooks without saving changes, and
4a. Re-apply external workbooks protection.
5. Put necessary ErrorHandlers.


Your help is much appreciated!

 

[Rijnsent]

Hey Cats & Dogs (funky name by the way),
you question is clear and not overly complicated, but you forgot to post the code that you created so far . If you've got no code yet, try e.g. these pages to understand some of the basics:
Excel VBA Tutorial - EasyExcelVBA.com or VBA Course : Introduction
I'd be happy to help you with chuncks of code once you get yourself started. As you might have noticed you can't attach files here, but a link to dropbox/google drive files will do the trick if you want to share a file.
Cheers,
Koen