Nano Tanks (11-30gal)

So after years of wanting a marine tank I've finally taken the plunge. Got a river reef 94 off a friend of mine who closed it down. Not got a clue where to start with it so started reading bits and getting help off my friend. Set it up on Sunday 03/05/15. Added salt water from cascade in bury who also gave me some sand out of one of there tanks to help it off.

My friend is coming round after the first week to test all levels in tank and to point me in the right direction of what to do...