The usual approach would be to alternate walking and sitting.
I start by alternating 30 minutes walking 30 minutes sitting, and build up to 1 hour walking, 1 hour sitting after a day or two.
In a communal situation you need to work this around meals and so on. If I'm at my local Wat we have morning Chanting 6:30-7:00, then 30 minutes group meditation, then breakfast.
Lunch at about 11:00.
Evening Chanting at 6.
Discuss what I've been experiencing with one of the monks at about 7:00.
To fit in with that, I usually get up at either 4 or 5 and go to bed at about 9:30 or 10:00.
If I were doing it completely solo, I would probably make use of something like Patrick Kearney's retreat recording: http://www.dharmasalon.net/Audio/audio.html
which generally have a morning instruction/discussion and an evening talk.
On the first day I sometimes use metta for the sitting meditation to build concentration and settle down. After that I would do it at the end of the day.