To get started develope a marketing plan with all the touch points. Identify your target market (s), if there is more than one rank them in order of who you want to address first. Do the research to find out where they get their trusted sources of information from. Decide on your value proposition. Create a story around your product's purpose and results. Create a social media plan and ask your current users (employees in this case) to share their experience using your product on social media. There are several other factors to consider and implement. This should help you in your decision to self market or work with an agency.