Time to filter my brain

So I have been so busy trying to wrap my head around all of the marketing tips, advice, ideas and trying to implement it all, that I forgot one important thing....Inventory. As an artist, I want to create each and every new idea that pops into my head. The problem with this is that I end up with 10 categories! 2 of this, 1 of that, 6 of this, you get the picture. When I list the '1 of this' and a customer sees it in a search, they may come to my store, but how would it keep them there? Without proper inventory, meaning a good selection of the item that brought them there to start with to choose from, there is nothing more for them to browse. They MAY see other things they like, for instance came looking for a Kindle Case then saw a Cell Phone Sleeve they liked, but let's face it, that's rare. If they came because they found my 1 Kindle Case and I have no others, poof they are gone!
I understand the importance of marketing as it is VITAL to an on-line store or any venture for that matter, however I now understand the importance of selection and a large inventory. I was so excited to have enough items to open with, that I failed to see the need to have several items of each thing I offer. I jumped on the marketing and promoting wagon immediately and neglected to focus on selection choice in each category. I was bouncing around too much.
So lesson learned! Now my marketing and promoting are on hold and I'm back to creating like a mad woman! This will take time I know, but at least I'm doing what I love and learning patience in the process!