Walk your inventory.

Start your day with a walk around the lot to see what inventory is available and where specific vehicles are located. Do any units need attention? Are they dirty and need a detail? Don't lose a deal because you couldn't find a car or you showed one that was dirty inside or out. Knowing exactly where to take your customers will show that you value their time and know what you're doing.

Check you incoming inventory.

Get with your manager (once you know what you currently have in stock) and see what inventory is coming in. Keep this in your back pocket in case you cannot land a customer on something you have. If you've established a good rapport with the customer, your UP may be willing to wait a few days rather than going to the dealership down the road.  

Brush-up on product knowledge.

After seeing what you have on the lot, make sure you actually know about it. What are the specs? Which packages are available? How is it different (and better) than the competition? Have answers to these questions before they get asked - it'll make you look like a true professional.