Here is an article on cycling your tank:
Cycle your salt tank - Aquarium Advice
It is pretty simple, I prefer to throw a shrimp in some panty hose and let it do its part. That will provide the ammonia source you need to cycle your tank. It takes a couple of weeks to a month, every tank cycles differently.
Though using a ton of fish food will also work, this stuff is generally packed with phosphates and you should want to aim away from adding such things to your system even though you'll be doing a water change at the end of your cycle to bring the nitrates down.
People make claim to products that 'cycle' your tank, but there is no definitive claim that they work besides the manufactures. People have claimed that it will speed your cycle along, but I have not seen this personally and don't recommend using such products as for every time I've heard that it works I have also heard that it did absolutely nothing.