The plants must have either been in pots which they don't ship, or
been growing in trays and they just dig one out when you order one.
Let's hope they dig one out of a tray anyway, and don't dig one out
of some convenient CP habitat!
It's up to you whether to grow in pots or not. Pots have the
advantage of portability, and make it easier to check what's wrong if
a plant has a problem, but people also grow their plants bedded out
in 'bogs'.
Soil mixture should almost certainly be mainly peat - just the raw
brown stuff, not premixed with fertilizer etc as a potting soil.
You can add Perlite, or lime-free sand if you want. Some people use
sphagnum moss, but I never have (I wouldn't know where to get it).
By the way, if you can find any other CP freaks in your
neighbourhood, then you might be able to beg some free Drosera
capensis. It is very easy, grows like a weed, and comes up from seed
all over the place.
-- Clarke Brunt (clarke@brunt.demon.co.uk)