new to hobby filter conversion?

[Trigger Happy]

I want to convert my freshwater to reef. I'm not drilling my tank or using a sump. I do have a large ehime canister filter. I don't know what to put in the filter. I understand "nitrate trap" Live rock rubble ? I will also be using a turbofloater 1000 Aquamedic skimmer. tank will be 150 g and I plan to eventually get some live rock.