One of the challenges in building a cabinet for hand tools, is that as soon as you define a place for each tool in your custom cabinet, you find that you need more room to store the must have tools you just bought. I decided to make a couple of open cabinets, and employ the use of inserts that can be replaced or modified as my tool collection grows. Part of the goal was to make a clean, efficient shop, while keeping to a budget. I bought paint grade maple plywood and made the cabinets. Applying a solid maple face frame to the cabinet makes a clean looking cabinet from sheet goods purchased at $50/sheet.
Depending on your situation, you may need to upgrade to 200 amp electrical service in order to meet the needs of your house and your shop. It may also be in your interests to add in a separate electrical service meter on your shop so that you can clearly write off electrical use for your business, or in future rent the space out and clearly separate out the utilities for billing your tenant. Generally, you don’t want to skimp on the power to your shop or on the lighting you include.
Other important power tools—A good jigsaw will help get you through many tasks, particularly cutting curves, that would otherwise require a bandsaw. Look for one with blade guides that keep blade deflection to a minimum. A handheld drill is also essential. A quality corded drill is much less expensive than a cordless one, and will never leave you without a charge. Also look for a quality random-orbit sander with a provision for dust collection.
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.