Click the green flag :) When the birthday cake asks you 'goblin or centaur', it is asking what you would like to populate your village with. Down arrow to build a house for 10 money. This increases the population and unemployed people. Population increases money. Up arrow to build a market for 15 money and 1 unemployed. This produces money based on how much unemployed people there is to buy things. Right arrow to build a barracks for 20 money and 4 unemployed. A dragon comes by every 2 minutes (it won't start coming until you build your first barracks) and knights will defend the village. You need at least 20 to be fully safe. Space to build an airship for 5 unemployed and 100 money. This produces trades which can be exchanged. E to exchange trades for money
Everything is from the library and others from the interwebs