It will be more troublesome to draw a flow chart with word, and it may take half a day to draw it well. You can consider completing it in a special drawing tool and then inserting it into word, such as ProcessOn.

For example, such a paper frame can be completed.

You can drag the graphics directly into the canvas with the mouse, and then customize the connection, position arrangement and color setting according to your needs. After the final completion, it can be downloaded to png or HD pdf for use.