Need help! Modding Problems

[Mek Simmur al Ragaski]

Right, seens as though my other thread was a complete mess, i would like to ask question and make them make sense, so here i go:

1.When you use the unpacker, people say that you have to delete two files, something like 'descr_geography' If i delete it and then save, will it save or will i have to edit the file making it a non read me etc.

2.To alter the descr_strat files, such as editing the campaign options so they are all available (apart from Papal States, Slave, Mongols and Timurids, and the other one) I have edited the files to a read me, but then it says
'Cannot create C:/Program Files/SEGA/Medieval II Total War/data/world/maps/campaign/Imperial_campaign/descr_strat.txt.file
Make sure the path and file name are correct'
I just kept cracking at it, putting it to read me, doing the administrator things, and it came up with
'descr_strat
This file is set to read-only
Try again with a different file name'
What have i done wrong here, do i have to use the unpacker before i can edit this??? Or do i have to make a seperate batch folder and copy the descr_strat file into there and save it???

3.On a previous thread i made, i think Poor Bloody Infantry mentioned a batch file, how do you make on of these, or can you only make one once you have used the unpacker???

i would really like some help please, especially with the unpacker part, i keep almost doing it, then forgetting that as soon as i do i wont be able to play M2TW until i edit the files, which might never happen...