Number And Highlight New Row In Table

I'm trying to create an audit log worksheet on the different steps taken to resolve a problem e.g

1 fill kettle with water
2 plug kettle in

etc, etc.

What I would like is for each new row to be entered the number of row is automatically displayed and for the contents of this row to be either in a different coloured font or have a coloured pattern.

I would also like that at the end of each row completed a command button is pressed to return the cursor to the new row and provide the above. Ideally, the row just completed should return back to a normal coloured font or have the pattern removed.
I presume this would require nested if statements within the command button but unfortunately its far too complicated for my excel skills.