Basement Egress Doors

"Hi Carl,I need to know where to start with making an entrance to my basement from the back yard.I live in a rambler style home that sits quite high in the ground.Where do I start. Who do I look for to do the construction?ThanksKim"Hi Kim,Approximately how high above grade (ground) is the top of the basement wall in the area you want an entrance?Carl"Hi Carl,Approx 4.5 to 5 feet from ground level