As a beginner, you want to study the work of other copywriters. Study the master copywriters’ work. You’ll start picking up patterns by studying master copywriters’ work. You’ll notice headlines that work, and note their style and flow. It’s not that you’re copying their work, you’re only learning styles of writing that work and formatting that works.
I got my first writing gig on Upwork, helping a guy rewrite some content for his ecolodge website. The pay was only about 5 bucks each, but after I’d helped him with a few pages and blog posts he asked me to help him respond to his customer reviews on TripAdvisor for $125. I’ve gotten a few more clients since then, and not one of them has come from my website; it’s all either been through Upwork (mostly small-time) or from talking to friends and family (much more profitable).
There are many firms that offer content marketing services, often paired with SEO or PR. If you’re simply too busy to do it yourself and aren’t ready to manage it in-house, then hiring a firm may be your best option. But if you want to jump in and do your own content marketing the easiest way is to start blogging. It will likely be hard at first, but the more you do it, the better you’ll get at it. Following tips from websites like Copyblogger you’ll quickly learn how to craft content for your website or blog that will engage readers and turn them into customers or clients. But while technically good writing and the right headlines can help, it’s not the key to creating great content that is the best form of content marketing.