I start by making good old fashion sketches. Then the finalisation process begins after that using 3D making and at the end good professional renderings for the final presentation. Sometimes also prototype making.
I get up 5 o clock. Then i start talking with vendors from Asia. During the day i start the team work with my employees. Talks with clients. Meetings etc. But also i am a "hands on guy" I dont mind getting my hands dirty in the prototype workshop. Actually i love that discipline. Often i end my days at the office arround 19.
It depends on the client. Find out who your client is first. Find out how he thinks. And then make your presentation concept. Try to match it with some marketing ideas. The the client can much easier see himself in it.