I highly suggest you read the question I asked for some good related information: How do you separate or integrate your work and home life when telecommuting?
Here are a few things I have picked up working from home 1 day a week (with a brief stint of 4 days a week when I slipped a disc)
1 - Schedule: Try to have a regular, reliable schedule so people know when they can schedule meetings and when they can get you on the phone / IM
2 - Communication: You'll need to make an effort to do more of this since you won't have that incidental communication that comes from being in the same space. I find it's nice to have multiple lines of communication.
- Messaging client for quick questions and chatter
- Email for longer messages / Profession communication / Things that need to have some persistence.
- Phone / Video chat for more complicated subjects that need back and forth
3 - Space: I work out of my home office, I can Google something and have it up on my personal computer for easy review, I can play music, hop on a stack exchange site if I need a quick break, etc. But I find I have to have a space that I can move to that doesn't have a pile of bills or my personal to-do lists around if those things start eating up cycles in my head. Your kitchen table or living room with the TV off will probably be fine but it needs to have minimal distractions.
The main thing you need to do is be mindful of how you are spending your time and attention, even to the point where you keep a personal time log for a few days and revisit it every month or two to make sure you are staying on track. Tweak your schedule, communication, and space as needed.