1. Always be aware of your surroundings
2. Keep tips in the back
3. Use down time wisely
4. Keep cell phone on you
5. Get payment up front
6. If customer makes you feel uncomfortable pretend coworker is in the back
7. If multiple customers come in at once, get orders first, apologize in advance for any inconvenience and make order
8. Don't miss drops
9. Don't be in break room stay up front.

Important

1. Communication with customers is the key so you can handle multiple customers and orders. Continually inform customers where you're at, examples: "Hello, having coffee?. I'll be right with you after I place this order"; "Hi, I'm just preparing this order, I'll be right with you, having coffee?"; "Hi, I need to take this order and I'll be right with you, having coffee?"; "I'm just clearing this table, I'll  be right with you, having coffee?"
   
2. Write dine-in orders just like normal and enter them through the POS system before preparing them just like if there are two workers.
3. In getting payment up front, explain "I'm on duty alone right now, my coworker stepped away for a moment, so  would you mind if I go ahead and collect now?"