half and half is 1 part milk to 1 part cream. yes, you don't get as much, but i wasn't always able to find heavy cream.
as far as recipes, i've not made anything other than straight butter. haven't made it in a while, but it does work better when the cream is not straight outta the fridge cold, unless your trying to make whipping cream
just churn till the butter forms, skim butter into a bowl (i've always used a wooden bowl, as i've been told by older relatives that that is what they use and it works best; don't know if it truly works best, or not). using the back side of a wooden spoon, keep smooshing it into the sides of the bowl. as you do this, more whey gets squeezed out. add salt, then start smooshing again.
to be honest, i've never measured how much salt i put in it, either :?
the only thing i don't like about fresh butter, is how hard it gets when chilled.