A sales funnel only works if people actually enter the sales funnel. To get those people, you either need an audience (your email list, blog readers, podcast listeners, social media followers, etc.), or a willingness to hustle and/or spend money on ads to get people into the funnel. Until you get people into your sales funnel, it won’t convert anyone.
WordPress boasts of being easy to use for amateurs. However, their support is ludicrously awful--forums only, no backup for more difficult situations. I had an 5 yr plus site that, several dead laptops later--a lost passord & original receipt, pre-2-factor, a free site--that I have lost access to . WP kept repeatedly sending the same canned messages that gave no help at all. I've been at it for WEEKS, & though onechat person offered to send me to customer help, that never happened. I strongly recommend avoiding WordPress.
Not having a sales funnel for your online course is the equivalent of setting up a lemonade stand in the middle of the desert where no one will ever find it. Sure, it may be super hot outside. Sure, your lemonade may be delicious. But if you’re not giving people a clear path to follow and that leads to your lemonade stand, they will never find it. This “build it and (hope) they will come” approach rarely translates into sales and enrolments, at least in the real world.