what does that mean 100 prims

[Rolig Loon]

No.  You rented an empty space, and you have a Land Impact allowance equivalent to 100 prims.  That is, you may rez up to 100 prims (or the mesh equivalent) in that space.  Every bit of merchandise, shelving, vendors, signage, lighting, and other stuff you create or bring into that shop counts against that allowance.

Read https://community.secondlife.com/t5/English-Knowledge-Base/Calculating-land-impact/ta-p/974163 for more information about land impact.

[Rolig Loon]

No.  You rented an empty space, and you have a Land Impact allowance equivalent to 100 prims.  That is, you may rez up to 100 prims (or the mesh equivalent) in that space.  Every bit of merchandise, shelving, vendors, signage, lighting, and other stuff you create or bring into that shop counts against that allowance.

Read https://community.secondlife.com/t5/English-Knowledge-Base/Calculating-land-impact/ta-p/974163 for more information about land impact.

[Roche Runo]

Whey you buy something in second life or from the market  place,  the item your purchesed is made of of prims(parts).  If you right click on something and select edit  you will see the parts highlighted with a blue glow.   The box  that pops up when you click on it will tell you the number of prims the object uses.    You are limited to 100 prims.  So all the items(objects) that you put in can only add up to 100 prims.   Now there is  a way around that  but not all landowners all alow that  so check with yours  before you do that.    You can link  non-scripted items  together  and use  the  convex hull feature.   Just goggle  Second life  Linking prims   and  Second life  Convex Hull . 

Hope that helps