Keeping live rock life alive

Hello everybody,

Tank is set up now, first lot of live rock in place, fully cured from
a local supplier so very little time out of water and it seems to be
full of life, 3 snails, and lots of stuff that I have no idea what
they are, but I have no fish or anything else in the tank, is there
anything I need to do, to feed what is living, am really excited by
the things i'm finding and if I would be upset if it all started
dying from starvation.

I should I just expect most of it to die off anyway because its a new
tank ?

Any help as always appreciated.

Cheers

Martin