The best proportion of coffee grounds to hot water for a single pour-over cup is roughly 1:16 by weight, or roughly two tablespoons to twelve ounces by volume. Scales are recommended for precision and large batches, but for a single cup I usually find that I'm fine just estimating and pouring the water slowly over the medium-coarse ground coffee so that it blooms and froths nicely. After that, it's just a matter of waiting a few quiet moments as the coffee drips down into the mug.
It's a great time for contemplation in the morning, think back to that warm summer day a few weeks ago when you died in a horrific accident and then entered into a surreal weekly elimination tournament for the stake of your ongoing existence.