It depends partly on the layout of the page and how you are achieving
double-sided printing. To move to the next recipient, you need to insert a
<<Next record>> (i.e. { NEXT }) field in the document.

So in you case you might for example
a. lay out your section as having 2 columns,
b. put the fields, text and images for the 1st part of the flyer in the
left hand column,
c. copy the column content
d. insert a column break
e. paste the column content. You now have two identical columns.
f. at the top of column 2, insert a { NEXT } field.

If you are doing double-sided printing by printing all the side "A"s. then
turning the paper over and printing all the side "B"s as a separate job,
that should do it, all other things being equal. If you're doing it as a
duplex print you might need to do more to retain the side A, column 1 data
to print on side B, column 2. But maybe we could cross that bridge if you
come to it.

Peter Jamieson