The second (and cheaper) path assumes that you have the design and dev chops yourself to build your dream software. Naturally, it’ll take more time to get your product off the ground, but being able to bootstrap the development of your software lets you retain more ownership in your business and be more in control of your path, making this a lower-cost, but higher time investment to make money selling apps.
Clickbank U. was seriously lacking in their affiliate training course. That's not unexpected though! Their affiliate training course seemed like a side project, instead of a main course. For serious affiliates, I recommend joining the top affiliate training center online. They've been training successful affiliates for over 15 years now, including myself (six-figure income earner).
With drop shipping, you’re effectively partnering with a manufacturer or wholesaler to sell their products. This way, you don’t pay upfront costs to buy inventory, aren’t sitting on unsold items taking up expensive warehouse space, and don’t have to deal with shipping the products yourself. You simply create your site, fill it with drop shippable products, and drive in customers, with almost everything else done for you.