As far as the wick is concerned, trim it flat and light it when it is just protruding the holder. If you then leave it alone for a minute and turn it down as low as you dare so the flame is only 1/2 inch (12.7mm for you metrics) tall.

Dont be afraid that this is too low as the heat it generates is amazing. You use less fuel and won't get sooty. What most people don't realise is that you have to do this every time you light it.
Hope this helps
Darren