Add Item to Chart (Add Straight Line, Change Bar Chart Shape, Format Axis)

Hi, i am doing a Time line for my company,

However, i am trying to do some cosmetic work. Please refer to my file

I want to
1) Add a straightline for Today()
2) Change the last bar chart to a Arrow
3) Format the date axis to show 1st day, eomonth and last day
4) Y-axis gap to be smaller without adjusting the bar width.