Programming :: Create Graph In Gnuplot ?

I need a script that takes data fom a file mydata.dat and create a graph. the content of mydata.dat is Bin Data1 Data2 Data3

Then it asks from the user to select which colums with use for x and which for y. the x and y titles must be generated automaticly by the names of each column from the first line of mydata.dat the limits must also be auto generated by the width of the column (for example for data2 is 12-45). in the end for graph title must shown the current time and date in this format:

So it asks for the user the columns and in the end it shows the graph with the above settings.