Final answer:
The first step in developing a media plan for a shoe company that just went national is identifying the target audience.
Step-by-step explanation:
The first step in developing a media plan for a shoe company that just went national is identifying the target audience. This involves researching and analyzing the demographics, interests, and behaviors of potential customers who are likely to buy the shoe company's products. By understanding the target audience, Sam can tailor the media plan to effectively reach and engage them.