Commercial starters are not needed. The microbes that decompose the organic matter need nitrogen to grow. They raise the pH naturally. Lime raises the pH of the compost. Sprinkle the OM lightly.
Moisture is required for the microorganisms to grow.
If this happens, turn the pile and reduce the amount of water applied to it. In our dry climate, you may need to cover the pile to keep it moist. Turn the compost pile in on itself every few weeks and water regularly to keep the process active. The compost is ready when it turns dark brown, the individual leaves and other OM are indistinguishable and the whole has a sweet earthy odor. Use it to improve your soil and plant health.