Very freedom. Lol.

Work as much or as little as you want.
What you make, depends on your effort.

If I have any tips;

1) always check to make sure everything is there for each order.

2) Always contact your customer with a friendly;
 "Your food is on the way! I hope you enjoy your meal! Is there anything else you want me to grab whe I'm here? Sauces, napkins, extra straws, etc?"
(Makes contacting them if you get lost or can't find their apartment etc etc more forgiving on ratings and increases tip chances
)