Watering plants, correct amount?

I have 4 plants i just started in small pots. What amount of water should i give them, and during what stages?

Water until about 10% of the water runs out the bottom. This way you get a nice even soaking throughout the soil, and its not sopping wet.

This is assuming you don't have any gaps long the edge of your pot, and aren't pouring water down those like a dummy.