If you are new to Etsy, which is sounds like you are, don't worry about having a full shop. Just list as you go. What this does for you is keeps you at the top of the listings for a much longer period of time.
I would recommend putting a notice in your shop that you will be adding new things over the next couple of weeks - this should get people coming back. But what REALLY keeps them interested is that you will have something new at the top of the listings each day that you list something.
Some people list something every day just for that very reason. What happens if you list it all at once is you lose your multiple days of top of the listing exposure.
Even after someone has their shop fully stocked, some sellers recommend re-listing an item every day, regardless of whether or not it is going to expire. If you did this every day for a month -- keeping your shop with an item at the top of the listings every day -- it still would cost you only $6.00. That is EXTREMELY cheap advertising to be out in front of your customer base.
Just food for thought. Personally, when I took time to do this, it worked. However, I wasn't always the most diligent and let my shop sit there without much promotion because I had so many other things on my plate. I'm hoping to devote more quality activities and time to my Etsy store this time.
You will probably note that after you list something you get lots of view and then it kind of dies off after a while. This is the "top of the listing" phenomenon.
Good luck!