Your tool is waiting for you in the “Storage” of the plot where you bought it from. You can move your worker to that plot to pick up your item, or you can make a transport order. Use the “All my stuff” tab to see all of your items and the location of those items, then "Select all" tab.
This screenshot shows that you bought 5000 kg of iron ore, and it is now at location "01/-29". Click on this location and go to storage on it.
Click on the item in this storage that you want to move and select your worker, then click the "Move" button and write its quantity.