A walkthrough is way too hard to make due to the random nature of events. You're best of building the tavern first to get a steady stream of income, but if you get lucky and pop the event that has the orcs bring in a batch of treasure they find, that opens you up to make and buy a lot more things. That event might even be necessary if you want to infiltrate Raeve Keep, because you need to research Dark Subterfuge and Opulence, build a brothel, and hire some spies in that short turn limit to do so, which requires time and money (as the Brothel is one of the more expensive buildings to build).