1. First upgrade the roads that connects the City Hall to Stone Quarry and Claypit building. These are the combination materials you need most in upgrading the roads.
2. Second thing to do is upgrade the Stone Quarry building. Its one of the important requirement and a combination of Claypit to continue upgrading the roads.
3. Third is the Claypit. This is also an important supply in the beginning stage since this is one of the combination materials in upgrading the roads into the next level.
4. Fourth, continue upgrading the other roads that connects from the production buildings to the City Hall.
5. Fifth is the Wood Factory.While upgrading the other production buildings you also need this to be upgraded, due to demand. Wood is the main material in upgrading the buidings. More upgrade, more wood to be needed.
6. Sixth building to upgrade is the Farm or meat supplier. As you are upgrading the production buildings you need also workers to be able to complete the construction. You have to feed your worker in order to live and to continue on their job.
7. Seventh building to upgrade is the Vegetable Farm. Basic needs of the citizen aside from meat. So they need it more than the other supply to continue working in upgrading the buildings.
8. Last upgrade of the basic production buildings will be the Blacksmith Building. Its For the preparation in creating weapons for your military citizens.
9. As you have finished upgrading the basic production building expect more supply to come. Upgrade also your warehouse or Build another warehouse to avoid loosing your goods. Your hard work in earning more basic supply will be useless if you don't have not enough storage.
10. When you completed this step by step, At this moment your almost or already meet the requirements in creating a gold mine. Since you have now enough resources to start constructing the Last Production Building. Build it now.