Blueberries - where and when?

Hi

I want to plant three blueberry plants in pots.  Is now a good time or should I wait until spring?

Where is the best place to put them? I have a north facing garden, but its large and some areas at the bottom get a fair amount of sun.  Do they need full sun or could manage some shade?  I live on the coast too - do they need a sheltered spot (I could find one where its not too windy). Lots of variables!

Thanks