Growing Sweet corn, also corn,maize

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20 Oct 24 K-M Bourke (Australia - sub-tropical climate)
I never have much success growing from seed but I really want to level up my gardening. How much sun do I allow my seedling trays to get. In a sub-tropical climate the sun can be very intense on hot days and can dry them out very quickly. Should I use a greenhouse or is that too shady? How often should you water them? I assume the trays should be moist the whole time while they are germinating? Any advice would be appreciated.
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