Rep Power: 0

Hi. I am new here and just thought to get viable answers from the Honda Community. I have Honda civic 2010 auto sedan. I am observing couple of things which may or may not seem problem as they not getting their effect. I would appriciate your answers one by one of my query.
1st
A: When I start the engine early in the morning or whenever 1st in the day, its engine starts with whombling noise which slow down and vanish completely when get warm. Is it fine totally.!
B: At the same time even after 2 or 3 min ignition if I put reverse gear there is a sound like vibrating in the gear but that noise also cool down and smooth after 20 or 30 min after the 1st ignition in the day. Later ignition after small intervals don't have any sound. Only when ignition at cool.
2nd:
That problem arise later on that is whet I am eversing the car and pull brakes in reverse mode there is crow like sound or there seems noise from rear side of the car.
​​