Macro to append excel files

Hi

I am absolutely new to VBA and trying to create a macro for work. We get daily files with almost the same headers that needs to be consolidated at the end of every month. The headers on the files are usually the same, except at times an extra column may be added at the beginning.
I need a macro to do the following-
Prompt to select the desired files.
Read the headers and append only the desired header columns from these files to a master file(these are Account, User, Modified By, Version). The headers are present in row A. Also, the master file should select the header from the first file only and hence take only the data (row B) from the second file onwards so that the headers are not repeated in the middle in the master file.
In the master table, add a new column at the end which will be the name of the file.
In the master file generated, filter on the column "Version" and delete all the rows except Version="1.0"
Lastly, there are certain values in the excel files that need to be changed. So I need a replace function to change those values. (Ex- Alex to Abraham).

I am sorry, its alot to ask. But please help me. I am in a real crunch. Been at it for the last two day.