You'll only need nine essential hand tools to build your clubhouse.
1. A hammer that you can easily swing to pound in nails. For kids, a 12-ounce to 16-ounce "finish hammer", as shown above, is about right. If you are buying one, pick them up, and swing the different sizes for the right weight.
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2. A tape measure. A 10-foot or 12-foot tape is long enough for a clubhouse. These are also small enough to easily fit in your hand or your pocket.
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3. A handsaw. Get one of these short "Sharktooth" saws made by Stanley. They are very sharp, sized right for kids, will fit in a toolbox, and not too expensive.
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4. A pencil. Any pencil will work.
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5. A framing square. This is the perfect tool to mark boards for cutting with your saw. Get the smaller (7 inches on a side) metal or plastic one. The marks on it will be helpful for cutting angles later!
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6. A screwdriver. Get a standard and a phillips-style screwdriver, or a combination screwdriver that includes both.
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7. A level. A nine-inch long "Torpedo" type plastic level will work fine. Also, this small level will fit in any tool box.
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8. A pry bar. This is your tool for fixing goofs, or for helping with alterations and room additions later on. Sometimes called a "Wonder Bar"; Stanley Tools makes the best one.
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9. Sawhorses. These are necessary for sawing boards safely. You can buy a set or build the ones shown above. The lower height ( 24 inches) of these hand-built ones is better for young builders.
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Extra: A Nail pouch or tool belt. Lumber yards sell these canvas ones for very little.