10 years experience, running 1000's of campaigns for 100's of clients. I have a proven system of generating sales & leads by tapping into the Google Ads platform & delivering high performance on Search, Display, Remarketing, Local & Video Ads.
It depends on the type of customer you're targeting.
If your courses are for professionals, you could try something like Paid LinkedIn Advertising, targeting people in jobs who could benefit from your courses.
If your courses are targeting students, you could try Paid Facebook Advertising, targeting people in interest categories related to the courses.
Search engines are highly competitive battlegrounds for eLearning and your user experience, value proposition, credentials and pricing all need to be excellent to win new business there.
Pre-roll video would be a good strategy - YouTube ads targeting content/videos related to your courses. This is a higher cost strategy however, because you'll need to produce the videos.
Wherever you advertise remember that learning is aspirational (emotional) - so I'd try to use messaging and calls to action which are anchored in emotion, as opposed to pushing pricing or basic benefits.
I'd recommend using something like Instapage (or Optimizely) also, in the following way;
1. Setup a basic landing page template on Instapage (or similar) for one of the products you wish to buy.
2. You'll then be able to copy this template and update the text, SEO elements and images for unique each product.
3. Ensure each of your landing pages has the following unique elements;
a. Unique page titles, e.g.: Sell Fast Furniture Online | XYZ
b. Unique h1 headings, e.g.: Sell Furniture Online
c. Minimum 50% unique page content: for example, if each landing page has 200 words of content (including headings) ensure that you each individual landing page has 100 words unique to that page only.
4.When writing content for your pages do the following:
a. Use the Google Adwords Keyword Planner and research other ways people search for your service, e.g. "sell furniture", "furniture sales", "people who buy furniture", "where to sell furniture", etc.
b. In your content ensure you use variations of these keywords, this will help keep your content relevant to all the ways people might search for you, and also helps Google understand the true purpose of your pages.
This should ensure that each of your landing pages is unique and won't be considered spam or duplication.
Obviously there are many other methods and techniques, but this is a good starting point and will be reasonably fast to setup.
The next step beyond this would be to look at link building and content marketing to encourage other websites to link to yours - this will help Google to identify your website as a source of trustworthy information. There's a heap of good link building experts on Clarity, so it would be worth chatting to one of them at some point once you reach this stage.
Best of luck