Creating a Library
In this tutorial, we’ll be covering most of the processes that you’ll be going through to create a board. This of course, includes creating a schematic symbol from scratch. While KiCad’s libraries contain hundreds of common schematic symbols, you can’t expect the symbol for every single obscure microcontroller to be included. For instance, we will have to create the symbol for the PIC12LF1501 microcontroller that is used in this board. Doing this will require a bit of work with component datasheets, so expect to learn a thing or two about reading them on top of learning KiCad.
In order to create our custom schematic symbol, we will first need to create a new library to store it in. Back in the KiCad main window, open the Symbol Editor by clicking on its button or by hitting Ctrl+L. It will take a bit to load the symbols libraries but once completed you will be in the Symbol Editor application. To create a new library, go to File > New Library… You will then be presented with a pop-up that will prompt you to choose the library table to add it to. Choose Project, as we only want this library to be project wide. Select the location to create the library at, preferably in your project directory, and give it a helpful name, such as My_Tutorial_Symbols. You will now be back at the Symbol Editor window. To verify that your library has been properly added, search for it in the Libraries list on the left. If you don't have this list, click on the 
Toggle search tree button on the left toolbar and it should show up.