Every workshop needs a good work bench. A good bench is stable and flat, letting you estimate the flatness of your workpiece, and with plenty of space to hold the work and clamp it down.
You can buy nice workbenches for many hundreds of dollars, and then you can buy nice clamps for many more. I wanted to use this project as a learning experience, though. So I spent my time researching table plans, trying to pick one that would give me a good surface without being a big expense.