Don't mix coco and ffof. Since you're a newbie, stick to just the FFOF. You can mix some extra perilite with it if you have it on hand.
Get yourself a better container for the plant, I'd suggest some 3 gallon fabric grow bags.
Germinate your seeds and put them directly into their final home (the 3 gallon grow bags). Beforehand, you should fill the 3 gallon grow bag about 1/2-3/4 of the way full with your FFOF (+ perilite if possible) mixture. Fully soak it until you achieve some runoff. By doing that, afterwards when you plant your seed you won't have to water for 7-10 days. It's really that simple.