Start Early and play as England, as they have a solid defensive position and their mid game units will own the fields of Europe (Longbows and Billmen) also the catholic factions unit are much more 'user friendly than some of the more exotic units you get with the muslim factions.
If you have MTW I HIGHLY recommend getting VI as it not only adds a new campagne but also enhances the origonal campagns. Then get 2.01 patch. Then you will also be able to play it online.
Hope thats of some help!
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