Hi b'
EDIT: The demonstration below is done using Pages 5.6.2 in El Capitan.
Peter's comment above indicates the situation has changes in Pages 6.
B.
Table format should be the default values.
Your document must be a Word Processing document (ie. Text can be entered directly on the page, and flows from one page to te next).
Set the table to Move with Text. The rest just happens.
Example 1: Moved by added text above the table: The Table was inserted between the second and third paragraph of this random text. Then, using Copy/Past, Paragraphs of text were moved from below the tale to above it, until the table was forced to extend below the bottom margin (note that there are several returns forcing some space between the paragraph end and the table—there because I neglected to remove them):

Example 2: Moved by additional text in a cell in the bottom row: Text outside the table was moved below it using cut and paste, and continuing until the table moved up to Page 1. Then some text was cut from the paragraphs below the table, and pasted into a bottom row cell of the table. When the table became taller than the available space, the bottom row jumped to Page 2:

Note that Numbers automatically repeats the Header row on the second page.
Regards,
Barry