Hi, I'm new too, but I could probably help some...
First off, if you live in the US, it's really hard to find a cuttlefish because their only native in Europe and Australia (and other places around Asia???)
Also, cuttlefish grow up quickly so they need a pretty big tank (Colin said that he had some cuttlefish in his 200 gla. tank and even that wasn't big enough for one full grown cuttle) I guess it depends on what species you get too, I think Sepia Officionalis (grr spelling) is the most popular.
So, depending on where you live, bimacs are probably your best bet in the US.
Also, if you want to put other species in it (like fish) they'll most likely get eaten or eat it, so the cuttle would be the only thing you could put in it (other than it's food :P )
If I'm missing anything (or if I have any mistakes
) I'm sure someone else will respond 8)
hope this helps at present