Tie each process box to the next in sequence with an arrow. For a more compact representation drop the disk and report symbols, but leave the text and appropriate arrows. Keep your notation consistent. Pay attention to the direction of arrows. Normally arrows go left to right and top to bottom.
Emphasis is on data grouping.
Even the very simplest computer applications typically have 10-20 data elements. Individual data elements may number in the hundreds or thousands in a medium to large application. Data elements in an application often correspond to other data elements in complex ways. Entity-Relationship diagrams are a visualization model for these layouts. After all necessary data elements are determined, related elements are grouped into entities.