This is a guide to installing linux on the newer macbook 2017 models. I am personally using the 14,1 model but this will also work for the 13,1 models. As for anyother 13, x or 14,x models, check this repository for more specific instructions. I should also say that the repository previoulsy mentioned was a huge help in installing and is maintained by people who are actively trying to make the new macbook work, to the full extent, on Linux. If you encouter any issues that you cant resolve by google searching, try asking there.
This part is easy.