This is a fundamental question. A good place to start is with a survey of your property. Most municipalities have a maximum percentage of your lot that you can build on and standard setbacks from your property lines that you will need to adhere to without needing to request special permission to build. On a photocopy of your survey you can draw in what your local setbacks are in order to define the location within which you will be permitted to build. In a best-case scenario, you will have the space to build without compromising too much on space or location; otherwise, you may need to request a minor variance, which would allow you to circumvent an obstacle such as a setback.
In this video Dave Heller shares a detailed tutorial on making fancy London-style dovetails with a mitered corner. The London-style dovetail originated in, well, London where cabinetmakers sought to show off their joinery skills by cutting the finest pins possible. Adding a miter to dovetails is very useful for wrapping a dovetailed skirt around a tool chest, or for adding embellishment to a cupboard's carcass. In the very near future I'll be releasing the last video,