The quick answer to save you a lot of time is: hire a digital agency that understands your needs and can cover all your requirements, has demonstrable experience, whose working style you like, and fits your budget. Hire their services and focus only on evaluating results.
The slightly longer answer is for those who are in a different economic situation, and hiring an entire agency team is not a viable option. Look for an individual who understands your needs, has knowledge of various roles, whose working style you like, and has demonstrable experience in what you're looking for.
Regardless of which of these two groups of entrepreneurs you belong to, there is a fundamental common point for you to be able to evaluate the results you are hiring, wisely choose the person or agency, and understand what you are getting and what you can expect.
Simply put: know the different digital positions that exist at the moment.
¡SURPRISE!
A Community Manager cannot do graphic design, a Graphic Designer cannot do advertising, a Copywriter cannot take photos of your products... now... they may have the ability to, it's something we find in the market, but if you want to guarantee good results, you should leverage each person's knowledge in their strong area, or in other words: stick to what you know best.
When you hire a digital agency, you have many people, experts in different areas of expertise, who share their knowledge and build together. When you hire just one person, you might find someone super talented with many skills from different roles, who can also give you good results, but their scope will be much more limited because ultimately it's one person covering many functions.
Consider these brief descriptions to choose wisely whom to hire, whom to rely on from an agency, or what skills to expect from an independent individual who excels in:
Community Manager
Manages and develops a brand's presence on social media, interacts with the community, creates relevant content, and responds to inquiries and comments. Focuses on relationship building, reputation management, and creating engagement.
Social Media Manager
Designs and executes marketing strategies on social media, plans and creates content, manages advertising campaigns, and analyzes metrics. Focuses on brand promotion, lead generation, and increasing followers and reach on social media, providing instructions to the Community Manager.
Copywriter
Creates persuasive and engaging content for various communication channels, such as websites, advertisements, emails, and social media. Focuses on crafting compelling messages, using storytelling techniques, and adapting the brand's tone of voice to connect with the audience and drive desired actions.
Digital Trafficker
Manages and optimizes online advertising campaigns, using platforms such as Google Ads and Meta Ads. Focuses on audience segmentation, ad creation, and budget optimization to maximize return on advertising investment.
Audiovisual Creator
Produces engaging audiovisual content for digital platforms, such as videos, animations, and photographs. Focuses on visual storytelling, creative editing, the use of effects, and mastery of design and editing tools to convey messages in a impactful way.
Web Developer
Creates and maintains functional and appealing websites using programming languages and web technologies. Focuses on developing intuitive interfaces, optimizing performance, ensuring compatibility with different devices, and implementing required functionalities.
Account Manager
Manages client relationships, addresses their needs, provides strategic advice, and coordinates projects related to digital marketing. Focuses on client satisfaction, retention, identifying growth opportunities, and internal coordination of teams.
Graphic Designer
Creates visually appealing elements consistent with the brand identity, such as logos, images, infographics, and advertising material. Focuses on aesthetic design, selecting appropriate colors and fonts, and using graphic design tools to convey effective visual messages.
There are more positions, but these are some of the most common ones. Now you can choose with reasoning whom to hire so that your company grows and what to expect when someone tells you they are a Community Manager or Designer, for example.
Remember that one person cannot be an expert in 10 positions, and an expert team requires a greater investment. Think carefully, keep learning, and choose with arguments.