Adding products to my shopify store

I am not sure if I chose the right category. I would like to launch my Shopify store soon. My store is predominantly print on demand.

I have 20 designs and each of those 20 designs has to be uploaded to 23 different products, then tag and add to My Shopify store and put in the correct collections in my store. I need this job to be done very quickly.

I have already added a few items so please check to see which designs have already been uploaded to specific products.
Thanks