After years of executing email marketing programs, AND leading content development efforts, I can tell you most companies already generate a lot of valuable content. Here is what I would suggest:

1) Consider an automated "drip" campaign. This takes the form of an on-boarding set of emails or a welcome-series of emails. These should be no less than 3 emails, and can be as many future emails as you think is relevant to your customers. You can do the same for existing customers by giving away a whitepaper or other useful document in exchange for an email opt-in. The opt-in should be followed by additional automatic emails that provide new and relevant content that strengthens your brand and helps the customer with a pain point.

If you can muster the investment and human resources to get it done, it will serve you for a long time. From time to time, you will need to invest in updating the creative, but it will allow you to get back to focusing on your regular business.

2) Explore current sources of content. Your sales team may be creating extensive powerpoints that you could re-purpose into an article for sharing over email. Your PR or media team (or agency) may also have content that can be re-purposed. The other possible source of content could be training materials. If you're providing customers with classroom or online training, consider recording and transcribing key training sessions, and hiring an editor to wordsmith and polish the transcription into actual useful content. A freelance transcriber will cost you pennies to the dollar (look in upwork.com), and with the core knowledge and expertise "written down", a freelance editor should be able to polish it up into a useful format. As you think about the power of re-using spoken content, consider other sources such as the owner's keynote presentations.

3) Use a freelancer. Once you have the core "facts" needed for a content piece, you should be able to hire a skilled freelance writer to handle the wordsmithing and polishing. You may want to craft a complete business and customer overview document to provide potential freelance writers. A good freelance writer who is provided with solid source material and the right background should be able to create good content for you.

Likewise, invest the effort into creating a brand style guide that documents your owner's writing aesthetics so you can empower good freelance writers to deliver what you need. This should all be part of an overall "brand styleguide" resource.

Finding and hiring an effective freelance writer/editor will take time and effort. But once you do, you'll find yourself with an invaluable resource that will be worth the initial effort. Like with any other hire, you'll want to interview freelancers carefully, test a few out with easy and quick projects, before settling on one that works for your needs.

Feel free to schedule a consultation phone call if you have follow up questions to my thoughts.