How much sun/shade do hostas need?
The most important thing to remember is hosta are shade tolerant, not shade dependent.
In general, the more white a hosta has the more sun it needs to maintain vigor. Be aware though that some white centered hostas will burn in the sun.
A lot of the yellow/gold hosta do well with sun, and in fact have brighter colors in the sun.
Blue leaved plants do better in deeper shade since the blue color is from a waxy coating on the leaves. Too much sun will melt the waxy coating and you will end up with a green hosta.
No matter where you place the hosta, remember to water, water, water until it is established.
If you have a particular variety in mind please post an individual request for information on the Hosta Forum.