There are lots of things to consider when starting a project. Doing so with Revit is no different. Here's a couple comments that will save you some trouble later.
Number One - Forget about True North!
Revit has a bias or assumption that you are going to ignore True North when you start out, probably because you don't have a survey yet. Sustainable design demands that you think about True North for proper sun orientation but let's just pretend for a moment that you are more interested in making it easy to document the building than its sun orientation. This means that Revit has assigned every plan oriented view (stock templates) to Project North. Model your building so that it is easy, horizontal or vertical as opposed to at 45 degrees. Don't worry about True North because you can define the True North orientation quite easily later, using a couple different approaches.
Number Two - Model separate buildings in separate files!
It is quite literally a major pain in the back side to move a building in a project after a significant amount of work has been done. There are some things that are unavoidable but changing the position of an entire building is a trivial matter when they are separate and linked into a master site file. Use the site file to organize separate building relationships. If they change, move the building, update the building's shared coordinates and move on.
The poor sap who didn't do this is now spending several hours trying to select every last little thing in a multitude of views to reposition their building while you are sipping a drink at happy hour at the Marriott with a few dozen friends. Here's a video that summarize these two points.
Forewarned is at happy hour...or soccer practice...or the archery range...