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 general, a table saw requires at least eight feet in front and behind to accommodate standard sheet goods and four feet side to side. A work table should provide four feet clearance on all sides, and pathways between tables, benches and storage units should be three feet wide. Proper clearance will allow you to move about with ease while you work.
A landscape designer friend of mine tells a story about the college he went to. During his years there, the university embarked upon an ambitious building plan, adding several large structures around the main quad: a dorm, a chemistry lab, and a couple of others. The look of the place, which had remained unchanged for a century, was suddenly transformed, as glass-and-steel modernist structures were interspersed with the earlier ivy-covered stone Victorian-Gothic.

Because of my son’s disability and my need to teach him just about everything, I have items sorted into bins with handles, labeled with the category (i.e, Sanding, Cutting, Measuring, etc). It’s over-simplified and over-organized, but necessary in our case. One thing nice about it is that we never waste time looking for something; everything has its place.
The planners did an interesting thing, my friend recalls. Instead of commissioning a hugely expensive study to try to predict the new patterns that would result from the opening of the new buildings, rather than devising an anticipated program and laying out a new scheme, the university’s brain trust decided to let the students and faculty, the lifeblood of the university, shape their own arterial flow.
The router—The router is the master when it comes to flexibility. Its potential far exceeds trimming and decorative edge treatments. A router will cut mortises, rabbets, and dadoes, and adding a router table builds in even more versatility, including biscuit joinery and raised-panel doors. But where the router distinguishes itself from all other tools is in its ability to produce identical parts using a pattern.
As the comic George Carlin might say, a shop is mostly just “a place to put your stuff.” The physical aspect of a shop is indeed simply a space of some kind — a garage, a barn, a teepee — that keeps the rain, rust, and robbers away and houses a collection of implements needed to saw, plane, slice, sand, and pound raw wood into useful objects. But just like the difference between a house and a home, what transforms a building full of tools into a comfortable workshop goes beyond the mere physical aspect.