1) How do I get the three (3) items columns to be right underneath the ''Recovery Turnaround Days of Files Per Cheque'' heading
I'll assume just resizing and moving the graph is not an option. If you right click on the x-axis and choose 'Format Axis...' there are some values you can change, but I don't think they provide the amount of control you are looking for. Excel does not let you micromanage the placement of each column in the graph; however, if you wish to do this I believe your best bet is to create some 'empty' data columns to graph on the right so that it pushes all of your other columns to the left. This implies you will need to copy your data to another section and then graph this new section which includes the empty data (i.e. blank text and 0 for numbers).

2) How do I get each of items #1 - 3 column, to have each their own color (that is not the same color as the '' Average Recovery Days '' column color)
Click on the data series you want to change - it should highlight all of the columns of the same color. Now click again on just one of the highlighted columns - it should now be the only column highlighted. Right click on it and choose 'Format Data Point...' and then choose your color fill.