There is a good chance you may be working in a remote environment from your client.
You need to setup channels so you and your clients can communicate in real time. There are lot of instant messaging tools you can use, but we have two which we use, and recommend.
If you created you email with Google apps, you already have a Gtalk enabled email chat. Add your clients gtalk.
For Skype, create a new account even if you already have a personal account. You can use Skype for text chatting, voice and video chatting.