"Reseeding" live rock

[rancor1]

I'm working my way up from a fish only "reef" to add coral back into my set up. I've got a pile of live rock - probably 200lbs - some of it is "old" (it's been in my tank for about 8 years now) and some of it was dead - rock I got as part of a tank buy out which had been allowed to dry out as the water evaporated. That "dead" rock is in a QT tank right now running to hopefully be recolonized by bacteria and to allow any dead life to rot off.

 

Before I start adding back coral, I'd like to recharge it and add back all the worms and various no-see-ums that were in my rock new. I had thought of putting a small amount to cure into the main tank and the sump to allow it be seed stock. Or should I bite the bullet and buy some more - either pre-cycled locally from a store (at fairly steep prices) or online and then cycle it before adding it. Or am I being crazy? Is there another alternative short of driving to the shore with a bucket and shovel? Also - how much "seed" should I get?