Cal here from Shopify, thanks for reaching out to us. I've taken a look at your store and you've done some really great work so far.
There are a few suggestions I'd like to make:
How are you deciding who your target audience is? Have you conducted market research to determine there is a need for your products in that chosen niche? Have you created a fleshed out marketing plan?
Hi! There's some great improvements there sitewide, which is great to see. The key to successful marketing now will be to isolate exactly who your audience is, and approaching them via the channels you expect them to use the most when making decisions to purchase your products.
If you opt to use Facebook marketing be sure to have some in-depth understanding of the behaviors and interests. This is called building marketing personas.