Rosary question

I was reading about rosary devotions and i’d like to start doing these but i am confused about what the first five Saturdays are, are they specific Saturdays of the year or just any 5 Saturdays in a row? also i was reading about rosary novenas and i don’t understand what it means to pray in petition and thanksgiving. can someone please explain?
Thank you

First Saturday of the month for five consecutive months.

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