You need to establish a city in the Upper Rhine area. The region has rich deposits of iron, and ample wood and farmlands. The iron in the region is of excellent quality and as such Rome expects to receive regular shipments of weapons forged from it. Unfortunately, the arable land is located in a less than stellar part of the region and there are rumors of instabilities in the mountains. The one thing that is lacking is space, so make good use of what you have. To make matters worse, the local population is not too happy about our presence here. Expect attacks by the local Helvetians as well as barbarians, but I repeat myself.
Invasions and requests go for up to 100 years. Price and demand changes stop after 30 years.
21/1 edit: New version added based on feedback from players. Economy made tighter, no more yoyo wages.