My favourite faction on RTW is the Germans but it's impossible for me to compete with the Romans. Whether I try to avoid provoking them or go for them early they seem to have an endless stream of armies to replace those that I destroy. I tried to go for their heartlands to stop the flow but laying siege results in the same ending - eventual defeat through lack of troops and money to fight the long game.
I suppose at the root of my problem is not building a strong enough economy from the start. Does anyone have any tips ? I tend to conquer Britain and northern Europe which I figure minimises the chance of even more factions coming to get me but is this the wrong way to go ? Thanks in advance.