2% on DEMO account, until he's consistently profitable (not to be called a newbie). Then start with very small risk on real (like 0.25%) and slowly increase.
Otherwise emotional issues will show their face and will lead to losses.
Pretty tough day and had many distractions (set up new ISP). But still something...
Here is an example of today's best trade for me:
http://www.cornixforex.com/2011/02/trade-example-from-today.html