I agree with camaro, it is amazing what sort of stuff will come out of a tank if left on its own for awhile, for example, when I moved I moved my whole tank, did not add anything at all, and as it is going to be a sps tank I have been letting it sit for the last 4 months, and even though I didn't add anything I have got some goodies and baddies, goodies include lots more feather dusters, some really nice colored ones, a boosted pod population, and other little things, some weird worms....the baddies include aiptasia...don't know where they came from but they are starting to take over...I have a few bottles of joe's juice on order.
I would start the refugium when ever it is convenient to you, I would add the algae and anything like that after the brunt of the cycle is over though.