Welcome to PTF! I know how frustrating it can be trying to be "informed" when first starting. Rex's guide is also the first one that made sense to me. I buy all of my dry Ferts from him, guess it's a loyalty thing but I've been very satisfied.
Best advice anyone gave me when I was setting up my 30G @ 3.75 WPG was to stuff if full of fast growing stem plants at first to out compete the Algae until the tank balances out. These plants suck up lots of nutrients.
GL and HTH.
Here's Rex's:
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Paulinax