Tesla's very first Model 3 could roll off the line today - here's what you need to know

Tesla is expecting to have a very big day.

The very first Model 3 is expected to roll off the assembly line. It will mark the start of production for Tesla's first mass-market car.

There will be handover party for the very first 30 Model 3 customers on July 28. Tesla will then ramp up production to 1,500 cars in September and, ultimately, 20,000 cars per month by December.

Tesla first unveiled the car last March and secured roughly 400,000 customers pre-orders for the vehicle.

We broke down everything you need to know about the Model 3 - here's a closer look: