AIM will automatically load your Unleashed products, so there's no need to do this yourself. You should see in the header the last transaction time and the time since information was updated into AIM from your account. If you want to create or import a new product into Unleashed, it will sync across into AIM shortly afterwards. 

You can import historic sales data in AIM to populate a rate of demand. 

Note that products without a rate of demand or stock on hand will be excluded from the modelling page, but you can create a forecast for future demand instead.