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GM Core / Chapter 2: Building Games / Building Creatures

Speed

Source GM Core pg. 119 2.0
Your creature's Speed should be 25 feet if it moves like a human. Beyond that, you can set the Speed to whatever makes sense. Remember that the creature can move up to triple this number if it spends its whole turn moving, so if you want the PCs to be able to chase the creature, its Speed can be only so high. Creatures at higher levels need ways to deal with flying PCs, speedy PCs, and PCs with more efficient actions that let them engage and retreat more easily. This might mean adding a fly Speed, giving the creature ranged attacks, and so forth.

Creatures can have climb and swim Speeds even at low levels. While you can give your creature a fly Speed at those low levels, it's better to wait until around 7th level (when PCs gain access to fly) to give your creature a fly Speed if it also has ranged attacks or another way to harry the PCs from a distance indefinitely.