One of the easiest ways to create an output file is to use the FileSystemObject. Here's some sample code you can use to create a text file and will show you how to write to it. Just use the WriteLine method throughout your script when you need to log something and then finally close the file at the end of your script:

Set FSO=CreateObject(''Scripting.FileSystemObject'')
Set FS=FSO.CreateTextFile(''C:logsUFTLog.txt'',True)
.....
.....
FS.WriteLine ''Some text to output''
FS.WriteLine ''Some more text''
.....
......
FS.Close
Set FS=Nothing
Set FSO=Nothing