I think steer manure would do the best for that. Home improvement and even some hardware stores will sell it in 50 lb bags. watch out for the smell though
You need fresh s__t as hardware manure has been processed, similar to milk being pasteurized.
It depends on who you talk which manure is the best. Sheep manure tends to have fewer seeds in it,
chicken manure has lots of nitrogen in it and is hot.
Leaves do not create a lot of heat yet they will self ignite. Placing them on top of the manure as insulation will slow the heat transfer.
Start your seeds inside better control of watering etc. Set them out in the cold frame after the last killing frost. If it is going to be cold overnight, approaching freezing, cover the frames with blankets or tarps.
Direction the cold frame should face depends on who you talk to, most are in agreement that they should be protected from the wind. Cold frames that face south are capable of cooking the plants they are supposed to protect.
Enjoy the fruits of your labour.
John
In school you get an education, the learn' comes later.