If you don't have a tripod and a remote
Picture 1. A flexible cheap arm bought in a photo accessories shop, attached to a chair. I do not recommend that particular type of arm - it is neither flexible or stiff enough even for small cameras.
Picture 2. Details of a wired remote (again a computer accessories shop) attached to the camera.
Picture 3. Professional flexible arm by Manfrotto (it is for lighting support rather than a camera). It is very solid but costs a lot.
I tried all that some years ago, and I recommend buying a good tripod whith short legs (if you want to keep it on a table together with the cradle) instead.