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I would not add fertilizer until plant is established. Mine grew well without any fertilizer added when planted in ground. Pellet supplied plenty of nutrients.
per http://www.jiffypot.com/en.html "Available in two sizes: 36 mm and 50 mm in XXL pellets"
yes.... Not sure about the smarter part, depends on your experience and expectations.
Yes. It is a mini greenhouse. It retains heat and will create condensation inside the greenhouse. This provides moisture for the seeds. If it creates too much condensation, just lift the plastic top a little to vent for a day, then replace the lid.
I don't think so. I can't find 'organic' label anywhere on the package.
I don't think there's a too old. I reuses mine if I have to. If the seeds I put on the pellet don't germinate. I save the pellet to use again some other time.
Not to my knowledge