Do I have to put sugar in? Is it important for making things rise etc? I haven't done much experimenting yet - too scared 
Also - I made a pizza dough which worked quite well but it said to leave it somewhere at 40 degrees to prove and I couldn't think of anywhere
. What/where might be a good place? We don't have an airing cupboard. Should I put it in a very cool oven?
Gah, I'm such a novice