Hello Pharnakes.

Take a look at the mod part of the forum:

https://forums.totalwar.org/vb/forumdisplay.php?f=40

the XL mod is tremendously popular and a new version has just been released.BKB is also good so I ve heard, and MedMod is worth trying:

http://wes.apolyton.net/

Then have a look at the Hosted Mods here:

https://forums.totalwar.org/vb/forumdisplay.php?f=74

VI refers to Viking Invasion, an expansion pack originally released separately for Medieval Total War. It is included in the Gold Edition as an integral part, so you don t need to get it separately.

Best wishes.