1 - You can change exp rates through Mobinfoserver.shn, using the shn editor its quite easy, just have that file open, click on tools, then exp editor and edit by factor.
2 - Well if you want to change everything to english, you'll have to edit everything. Sorry that's not an easy fix, although you could download the english repack.
3 - That's a client side file, just go to your client folder and use the windows search functions for a file with the name "Snow" in it. You should find a .nif file. Remove it.
4 - Go to your database, and change your characters admin lvl to 100.
Code:
UPDATE dbo.tCharacter
SET adminlevel = 100
WHERE tUser = ""
GO
5 - Shops? Not sure what you mean.
6 - You'll have to find the database called tCharacterShape. In there you'll find usernumbers and the number of their class. Look up the class numbers in your client.
7 - You can't D: unless you hex edit, at least that's the only way I've been able to do it ( I tend to overcomplicate stuff like that)
8 - Just searching on google, sure you'll find one. Be careful some are bugged.
Hope that helped