Let me just list down a few to do list if I were you and maybe you could use it as a guide line:-
1) Measure tank water volume. LXBXH divided by 1000.
2) Buy carbon, phosphate remover and wave maker. As according to your tank water volume.
3) Throw away coral chips and ceramic rings
4) Bring out all liverock for scraping.
5) Prepare for water change.
Do practice caution when you are handling the liverocks and please wear heavy duty gloves as there may be fire worms or other pest that my deliver their venomous stings.
Once the following procedure are completed my next step would be:-
1) Place liverocks in after scraping.
2) Do my water change.
3) Place carbons, phosphate remover and wavemaker in place.