raring to go
Very eager, excited, or anxious to go somewhere or begin doing something. The kids were already in the car and raring to go. After the rousing speech by the boss, the whole team was raring to go.
rarin' to go
extremely keen to act or do something. Jane can't wait to start her job. She's rarin' to go. Mary is rarin' to go and can't wait for her university term to start.