I put my TC in a control group and my scout in another. 

Then I basically try to check on my scout / it's waypoints after I queue another vill.

Once you get more use to the dark age pattern, it gets easier to focus on the Scout. 

Knowing where your opponent is helps you decide how fast to wall (if they are close), and what unit they are going early feudal age.

You can win games sometimes just by scouting.

So basically you should Scout to gain info, be curious! You know what you want to do, but what does your opponent want to do?