Why don't you start with just the Neutron, which is a self-contained semi-modular, so there are default connections made for you? There are some example patches in the manual that you can try reproducing and then altering. When you understand more about the functionality of the various parts, you will be able to introduce additional modules.
You might ask your Instagram friend the reasons for their choices and what they thought you would do with them. There are many Erica Synths Pico modules; you need to specify which one you have.