new tank need advice

next week we are getting a new(from a friend) 6 foot long tank. I want to
set it up for sal****er and move my fishesd into it. I would like to hear
any recommendations as to substrate material, filtration, etcetera.
is it okay to just have no gravel or sand or coral on the floor of the
aquarium, or would that be a bad idea? The tank is intended to be fish only,
with about five or six fish in it. Could I just put a very small amount of
crushed coral, or sand, and then jjust add a bunch of live rock?

Any idead, suggestions instructions will be appreciated.
you can mail me at mikdan at comcast dot net and add the numeral
seven between the mikdan and the ampersand. Thanks. Mike.