A great place to start is the Component Search Engine from Samacsys or SnapEDA. If you can't find your part in the Manufacturer Part Search panel, there's a good chance that one of these resources will have it. In fact, I wrote an article a while back detailing some great free footprint libraries that you can use. There are other options available to you before you resort to creating them manually. If you can't find the exact schematic symbol and footprint for your component in the Manufacturer Part Search panel, don't worry. Component Creation without Existing Models This article will look at alternative ways to bring model-less components into your Component Library without creating them from scratch. However, manufacturers and suppliers generally provide the component models directly through their connections to the Octopart database creating limitations with creating certain components. Connections to Octopart and IHS Markit populate the component information of the MPS panel. Thus the first step is to create an Integrated library project.In the last article, How do I Get Started with my Altium 365 Component Library?, we walked through the basics of component creation with the Manufacturer Part Search (MPS) panel in the Altium 365 Workspace. Thus package lib file is one that binds the various model files into a single integrated library file. One of them is to create a new package library(.PkgLib), add the schematic library(.SchLib)with schematic model, footprint library(.PcbLib) with footprint and other files(simulation, signal integrity, 3D) and compile the package library into integrated library file. There are number of ways to create Integrated Library file(.IntLib). This way designers can quickly have a unified library of a component instead of having distributed parts in different folder. Integrated library is one unique feature of Altium designer that allows users to have an integrated library of schematic symbol, footprint, simulation model, signal integrity file and 3D view of the component.

This is a overall tutorial on how to create an integrated library in Altium designer.

Altium compile schematic