Iberia has a lot of Mines... and a lot of strong Armour Piercing units... but for your fun id say to not expand there too early, leave lusotannan to expand and do not attack Rome too early too, let them to expand too.

Id say at first, try to develope your norhtern african provinces, and make it your base, and then you will start for iberia.

In my campaign, i waited a lot of time before to start to spread in Iberia, and it was very fun. Same for Italia. Take your time to conquer Afrika at first.