new arrivals. maxillaria hematoglossa, Thunia alba, Dendrobium williamsonii

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My long awaited orchids finally made it today, I was like a child unwrapping its christmas presents but now i am confused. All of them require a winters rest but theye all seem to have new growth on, the Dendrobium williamsonii is in bud, the Thunia alba has new growth at the base and the Maxillaria hematoglossa appears to have new leaf growth. when should I start watering? and do they need fertilizer? thank you in advance for any help you can give me, I am very new at this.