Inspiron 5515 and d3100 docking station

I have a couple of questions about using the D3100 docking station with an Inspiron 5515.

1, It looks like I cannot charge the Inspiron via the d3100 connection

2, Every time I close the Inspiron 5515 cover, the extended monitor goes dark.  Do I need to keep the pc cover open to use the monitor?  In the system display settings, I have selected "show only 2"  

3, There was no procedure on how to start the computer when using the D3100, do you start the computer after you have connected it to the D3100 or should you start the computer first then connect it to the D3100.  

Thanks for any guidance you could provide