Okay this is what the rule book say's.
Which Objective Tokens should be chosen?
When playing in Story Mode, first determine which Objective Tokens you’ll use in that game. To do that, take all the Objective Tokens that bear your unit’s Affiliation Symbol. If there are more than 4 Objective Tokens of a particular Objective Category, select only four, and return the rest to the box. Next, sort your remaining Objective Tokens into Main Objectives and Secondary Objectives. Finally, divide them into sub-groups based on their Objective Categories.
OKay so could someone explain this to me in English please as i think i'm over thinking it.