Your very first steps should be to build one Power Generator, one Diner, and one Water Treatment Plant. Assign dwellers with the highest S, A, and P stats respectively to these rooms. Ensure you have at least one dweller in each room. Monitor your resource bars closely. If any resource starts to dip into the red, immediately build another room of that type or upgrade an existing one. Remember that upgrading rooms costs Caps and increases their power consumption, so ensure your power supply can handle it. Aim for a small surplus of each resource to buffer against unexpected events like incidents or increased population.
