For easy start with inventory management account follow bellow steps.
Create Manufacturers database
Click on links below to see list current manufacturers and add new one:
Add new Manufacturer >>
Create Products database
Follow below links to create and mananage products database
First go check products list
Next, add new product
Product details >>Next, add new product
Product models >> Add new product model >>
Order / Invoice management
Follow below links to create and mananage products database