I feel your pain. I had some hard time myself to get my stm32l152 discovery board running initially. Too many possible pitfalls.
Then I started with STM32Cube which has lots of sample projects.
Just simply download the STM32cubeL0.zip archive. You’ll find it on the STM web page.
This includes bunch of examples for the L0.
Just load one at a time in ac6/system workbench. Build it and try it.