Random thoughts:
* Lay out a simple code quality wiki if you don't already have one
* Have quick one on ones every other week or so
* Let them pick their hardware as freely as possible.
* Allow them to modify the lighting in the workspace as freely as possible
* Set a standard for communication, this will be important as the team grows
* Keep in mind people really want Autonomy, Mastery and Purpose
* Give credit and praise freely