Littlegannon, use the PM system for personal messages.. (but yes, i was going to suggest that for our next joint-campaign)

Gaul starts with a large portion of land, but are at a strategic disadvantage. The primary one comes from the Julii to the south. Unless you capture Massilia and Lugdunum quickly, your northern Italian cities will fall from lack of troops pouring in from mainland France. The second one comes from the Britons and the Germans to the northeast. A quick paralyzing strike to the Britons on the mainland will cripple them temporarily. Keep them out of Gaul. The Germans, however, if unchecked, will steamroll through your cities like it was 1940. An alliance with Dacia and/or Scythia will prove benefitial in dealing with the Germanic threat. The third disadvantage is you are going to be backstabbed by Spain, and, to a lesser extent, Carthage. Hold Numantia at all costs, but if you see the Carthage steamrolling heading your way, you may as well raze all the buildings in the city and abandon it. You might get lucky with a rebellion.
kekvitare ^^^ This sounds like a brilliant strategy to begin with for the Gaul!