Hyde here from Shopify.
It's great that you've got your store up and running, and even got as far as creating a paid ad campaign.
What you've noticed, however, is that customers are drawn in by your campaign but are not completing the funnel through to conversion. We’ve put together a whole section here on our blog that deals with optimizing your conversion rate. There’s one blog in particular here that deals with ways to increase your conversions that I would recommend.
You'll also want to consider your marketing funnel and content. It's a common recommendation of mine on these forums because all too often not enough attention is paid to content.
Content is KING (or Queen) when it comes to selling your product. Here are resources for considering your customer's journey through your store, from the moment they land to the moment they (hopefully) make a purchase:
So you'll want to create original and innovative content to capture your customer. Three ways to do this are:
I hope this all helps, let me know if you have any other questions.
All the best, Hyde.