Lets see if we can find you some easy answers. The bees will decide when they have enough area for brood rearing. Most Beekeepers are using either a combination of 2 Deeps, or 3 mediums for the brood area. How to know when it is time to put the next chamber on, simple wait till the bees have pulled 80 precent of the previous frames with wax/brood and then start what is called "Opening the brood nest". This will get you the population of bees to get the honey. If you plan to be using foundation or not the bees tend NOT to like to go past the queen excluder till the wax has been drawn in the honey supers. Most Beeks aren't even using queen excluders anymore. Queens normally don't cross a honey barrier to get to open cells unless she's after drone cells. Same signs apply with knowing when to put on honey supers as does with swarming. When and if they start backfilling brood area in the frames with nectar...