Nick here from Shopify.
Facebook Ads can be tough even on the best of days. There is a very good method for Facebook Ads, especially when getting started which could be worth checking out. It's called the 3x3x3 method and requires you starting out with 3 different ads, for 3 different audiences with 3 different sets of copy/images and a small but the same budget for each. You then monitor the results of each of these campaigns and you will notice some ads will perform better than others. Once you see the ones which are more successful, you can drop the ones which aren't very successful and raise the budget on the ones which are reaching your desired audience. This is a great way to learn how to use Facebook ads effectively and learn your audience. There is a great article which goes into this in more detail which you can see by clicking here. Shopify also has a guide on all things Facebook ads which you can see here.
Another good option could be looking into Kit. Kit is a virtual employee for your store which helps you drive sales to your store through many different methods, one of which being Facebook Ads. The Kit team does regular webinars which are free to attend which. You can register for a Kit webinar to learn more directly from the team here.
All the best,