This is the most important part of every service provider. Especially when the competition is enormous. The first impression with the client should be fine both ways. This means you should see the client face-to-face. If there is chance to meet in person you should take it. He will show you what he wants, and what industry the Company covers. You will get information about the target he is aiming for and you can provide him with quick sketches to narrow the field of the design proposals. This way you can produce the project with great comfort and most important, the design proposals will please the client. If there is no chance to meet the client in person try Skype-video call, or any kind of video conference.
For a creative work where you have the client wishes in one hand and the designer ego in other, there should be a balance. This balance can be achieved only if you have asked more and more questions at the beginning. Remember, the client knows his target audience better than you do. If you have this in mind the rest of the process is very easy. If there is a problem you should ask your client, what is his main goal with the ongoing project? Understand this and the problem is history. Technically he is paying you to design his ideas.
The finishing process sometimes can be very long. To avoid this, send the client list of the services you provide and the steps you are planning to take for the project to be completed 100%. If you have the list written down you can remind him that he accepted these production steps, and the finishing part is taking too long. He will know when the project should end, and understand that he hired you to do this job. If the client is too involved in the process his Company may suffer lack of supervision. This means that you reckon the client so the result is next time you won't be hired again.
Maybe you know these things already or maybe you don't, either way every project and every client is a story for itself. But following some simple ways of doing things may help you as a service provider gain more success. Maybe you will find out that you are not the right guy for the job, or maybe you will have bad communication with the client and be ready for the problems at the begging.