for the live stuff find someone in the area with some liverock (all youll need for coralline is a fist sized peice to start it off)
the bacteria magically finds your house (i dont know how)
as for the bugs, when you buy frags and such, they will normally come on a chunk of live rock, in some cases this can be quite big and it will have worms and pods in and on it
HAHA I TOOK SO LONG WRITING THIS ONE THAT PIES BEAT ME TO IT
GOOD ADVISE FROM ABOVE AND BELOW