how to set a initial velocity
In movment component you can set velocity in defaults so it will be initial velocity value
https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/GameFramework/UMovementComponent/Velocity/index.html
If there is one, grab the actor’s static mesh component and apply Set Physics Linear Velocity.
Make sure that Simulate Physics (set simulate physics) is set to true in the first place.
