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Yes, rotting leaves can be good for your soil. The decaying leaves release nutrients into the soil that can boost the health of your plants, and the organic matter also helps improve airflow and water drainage.

Depending on the size of the river rock and the density of your soil, add woven landscape fabric or sand under river rock. The extra layer will ensure your river rock sits evenly and doesn't create puddles or uneven areas throughout the design. In some cases, nothing is necessary beneath river rock, but be sure to speak with a landscaper to keep your landscaping looking sharp.

Measure the area needing coverage and consult with suppliers on average depth requirements for each material. Calculations often use cubic yards for accuracy and practicality.

It depends. High-end colored mulch can be fairly costly. However, you'll have to replace less-expensive natural mulches, like pine needles and cedar mulch, more frequently. 

The cost is balanced out somewhat, though, as although you'll have to replace colored mulch less often, you'll have to replenish nutrients in your soil more frequently to make up for the decrease in organic matter and nitrogen from the mulch.