This previous post has a solution for producing different colors for bars in a chart (answer 4): Applying different colors to different bars in a vertical bar chart visualization
for #2, not exactly sure what you are asking. If you want to be able to click on elements of your chart to drill down, that is not supported by the built in visualizations. You could just build separate visualizations and bucket them by month, day, etc.
for #3, you can just view a saved search in your dashboard (Kibana 5 displaying raw data)