Here We go
Here we go could also be at the start of a race, expressing your about to leave the start line of the race.
Here we go! The race is going to start.
Going: (A family in a car, off on holiday) - 'Tickets? Passports?... Right, here we go.'
[Rummaging through a box], "Ah, here we go! I knew it was in here somewhere!"
You say to the passenger as you start your motorbike: "Are you ready? OK, here we go."
Jim is a driver. He picks up his friends from a restaurant and says:"Here we go guys!" Then he drives his car.