Well, Spain has most likely Warriors and Archers, judging their Monotheism gambit and early organized religion.
Why don't we scout Spain's lands before we plan any war? (Maybe you're already planning to do that.) It'd be nice to know exactly where their cities are located, and the exact number/strength of their troops. It'd also be nice to know if there's land to the west of Spain, and if so whether she's in contact with anyone. If she's got a great, powerful friend who would take offense if we declare war on her, it'd be nice to know that first.
BTW, exactly who is responsible for declaring whether and when we go to war? Is it this office or the diplomatic office?
In general your plans are good; but I think we need a little more info before we enact them.