Yo. I am currently upgrading from a small oven to a single deck convection oven and want to start sheet baking some of my cakes.
Is there anywhere online which has a good guide to baking times/recipes for this sort of thing?
Great for you....... convection ovens for sheet cakes works woderful.
There are some down sides to convection in that the air movement plays havoc on light items, like muffins or Pate Choux, but cookies, bread and cakes work great.
Every oven has its' own personality so giving you tips will be meaningless until you get to know your oven.
Generally speaking the convection oven is 50 degrees hotter then a conventional oven set at the same temperature.
The oven will have an instruction guide that comes with.
Also here on ChefTalk there is a search engine at the top of the page that will help you as this topic has been discussed before. Check it out.