Jim
Here are a couple of pictures of my house. We kept the original foundation and added to it so I did not have a complete blank state, kind of what you will be dealing with. I raised the garage and driveway with the hardscaping and tied it in around the house. There are no steps and the entrances are built with slopes to get over the door sills. There is no point building ramps if you don't take into account the door sills and the drainage requirements around the doors.
I also raised the yard so it would look proportional.
Steve