Flakes are more then likely yeast colonies. No worries
I hardly ever let my primer sugar cool enough as i should. It is a minimal amount of temp difference when adding to 5g of wort.
I don't use star san, so I can't answer this one.
Learn away! Just remember...the only bad question is an unasked one!
First State Brewers
Primary: StrawberryHop Saison
Bottle: Rochfort 10 Clone, Bourbon Oak Pumpkin Ale
Keg: Kolsh, Marzen, Saison, Belgian Strong Ale, Brewskie the Elder,Pomegranate Apfelwien, Rye Dortmunder Export, English Bitter