* Buy a good quality respirator and always keep handy so you'll actually use it. I like this one:
This respirator has a "down spout" exhaust which allows you to wear a face shield without fogging it up.
* Wear good quality, long welding gloves not just when welding, but also when using a cutting wheel, wire wheel or a portable grinder. (Gloves should not be worn when using a bench grinder. The wheel can grab the glove and pull your hand in.)
* Always have lots of safety glasses around so you won't be tempted to work without them because you can't quickly find them. Look for the multi-packs you can sometimes find at Costco. And insist any visitors to your shop also wear eye protection.
* Whenever practical, wear a face shield in addition to safety glasses. This offers extra protection for your eyes and protection for the rest of your face. (Face shields are cheap at home centers. When they get scratched, buy another one.)
* Store solvents and paint in a steel locker. Of course, a approved fire-proof locker is best. But if you can't afford one, at least use a steel office locker. You can sometimes find them at thrift stores.
* Wear nitrile gloves when working with sovent, paint or glue/adhesive.
* Keep your shop ventilated when welding, grinding, painting or using solvents.
* Be extremely careful with space heaters. Flammable materials can easily ignite if they come in contact with a space heater. Don't use paint or any flammable liquids with a space heater.
* Give yourself adequate light. If your shop doesn't have good, built-in lighting, buy a portable work light at a hardware or home center. They're inexpensive and make work safer and easier when you can see well. Here's an example:
Shop Utilitech 1000-Watt Halogen Stand Work Light at Lowes.com
Of course, also be extra careful with anything coming in contact with a work light. Those things get hot!
* Always use good quality, heavy-duty extension cords. Never plug a power tool or work light into a light duty "Christmas Tree" extension cord. And make sure whatever circuit you're using has adequate amps for your power tools. Never, ever bypass a circuit breaker or fuse.