I found myself in exactly the same position as you a few months back - first saltwater tank after "graduating" from fresh... Oh - and completely confused by the 10 people = 12 opinions...
I can only tell you what I did and what worked for me - I used Dr Tims One and Only to start my first reef tank, and have been super happy with the results.
HOWEVER - I followed the recipe EXACTLY 100% to the letter - Ammonia drops as per the recipe below. (Only posting this link since its not super easy to find from the Dr Tims site)
I have heard 101 opinions on cycling, but worked on the theory that someone with "Dr" (and yes he's a real doctor - its not just a marketing title) in their name, and a professional background in this stuff was worth trusting...
I too have heard that you can use a fish / fish food, but figured a calculated number of drops of Ammonia (Not just any old ammonia - Dr Tims - its cheap stuff and you only ever need one bottle) was more scientific...
Best of luck !