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John Innes will last for a few weeks to a month in your soil; so you would only need to water in that time. Perlite is a great for mixing in.
After a few weeks you could start to use your grow and bloom nutrients. Be careful with your dosage, start small.
With pre-fertilized soil you should have enough Nitrogen to see you through most of the growth phase, the Autofowering strains begin to flower after a few weeks.
Get some coco or peat pellets to germinate your seeds and make sure their taproot is pointing straight down when you plant into the final containers.
Hey my friend, ok firstly as your autoflower you want to have your girl straight into your big pot as they dont like transplanting. This means instead of having to burn through the John Innes in stages, it plows through the lot in 2-3 weeks. Especially with the voracious growth of autos.
Once you think its time to start feeding just go at half strength then next time just water and observe.
Id go feed water feed to start off. Then if required go up a notch in feed quantity.
As for everything else above you sound like you have a plan! We all tend to germinate in a different fashion
On watering frequency, once of a decent size; just water slowly until small amount of run off from the pot. Then keep lifting the pot until it feals nice and light. Dont ever let it go so dry that the plant starts to go limp though!