If you think about restarting your Roman campaign then do it. Now some advice:
1) Set up the taxes as high as possible in all of your cities. Just remember to stay above 100% public order level. By doing this from the very start of your campaign you will keep tight the population. They won't have time to "learn" what freedom and low taxes are, so they will be less likely to rebe. As your empire grows up you may want to lower your taxes (like from very high to high etc) but only if public order drops below 100%
2) Don't neglect shrines and temples. Focus on temples to Juno and Jupiter as they give the biggest bonus to public order. If mines can be build in of the regions build there a temple to Volcan, as it still provides public order bonus but also gives you extra income from mining.
3) The absolute minimum is to build Forum and Shipwright in every city. Build roads to the highest possible level.
4) Build farms (at least level 3) as they provide food to the city, especially huge cities need something to eat.
6) Develop walls and build suburbs/cities etc. as the city grows up.
7) Don't build any Settlement Growth Plan (or how are they called). You don't want your city population to grow up too fast as it would raise the poverty level.
8) Don't forget to build public baths/aqueducts etc. It will keep the citizens happy and protect them from being eaten by The Big Scary Plague

9) Build "extra" buildings like Grain Import Facilities, they increase trading income.
10) Don't expand too fast. Don't raise too many armies in shor time. You may have, let's say, 300 000 dennari, but war can put you in real financial troubles if you don't have a developed infrastructure providing you with constant stream of money.
11) Don't hesitate to (of course accidentally

) "Relocate population", it will raise public order and give you quite large amount of cash. When you conquer a city, and the window pops up asking you to decide what the city's fate will be, scroll the screen and look what the public order is. If you see "red face" then "relocate". If the face is blue or yellow, enslave. And remember to set taxes as high as possible.
12) As stated above by my predecesor, you have to find ballance between buildings making money and providing happiness.
13) Keep small garrisons.