copying data from many files and adding to a separate file (PLEASE HELP!)

Please help a newbie out, I am a complete novice at using macros in Excel! Here is my problem:

I have many "donor" excel documents that each have many separate worksheets, and these worksheets have names that remain the same from "donor" document to "donor" document. I want to create a different "master" document in which I collect all the numbers from one specific column in one specific worksheet from the "donor" document and add them to a column in the "master" document. The numbers in the sheet/column in the "donor" document always start at column A, row 3 but they can then vary how far down the column they go. So, for example, what I want is that the first set of numbers from the specific column/sheet in the "donor" document to be added to column A row 1 of the "master" document, then the the next set of numbers from the next "donor" document's column/sheet should be added underneath, in the next empty cell in the column A of the "master" document, and so on.

Does this make sense? Please let me know if this easily doable and if so how. I am fairly certain there is a macro that can be written in VBA to do this (?), just I don't have the relevant skills...