You must build a large population, (8,500). The Emperor and the Empires hunger for Oil, Wine, Weapons, Pottery & Furniture grows larger and larger by the years.
To help put you in a further bind, your trading partners will try to take advantage of you with slow and steady increase in items you need to desperately import. While at the same time driving prices down on your exports.
As a word of caution please do not neglect your defenses. The Visigoths are determined to "annex" your province with many, many large-scale invasions. So prepare early for them.
And as a final nuisance you will occasionally deal with a minor native uprising or two.