[SR-Users] How do I configure this thing?

OK, sorry for the basic question, but I'm overwhelmed. My install gives me a kamailio-basic.cfg, kamailio.cfg and kamailio-oob.cfg. Is there any explanation as to the difference between these? I assume "basic" is a simpler config, but I don't know what it lacks vs. kamailio.cfg, and I have no idea what "oob" means ("out-of-band?") The configs reference a kamailio-local.cfg. My assumption was that I could place config changes here, but I see later that kamailio.cfg changes some parameters. In particular, I set various auth_db parameters in kamailio-local.cfg which kamailio.cfg changes later. So I don't understand when I might want to use kamailio-local. The config files refer me to a cookbook, but unless I'm missing something, the cookbook is a long list of config directives. When I read "cookbook" I assume I'm being directed to something containing recipes like "how to enable web sockets," with step-by-step guides about which config files to edit and what to add. Am I just missing that? Is there a task-oriented getting started page that I'm missing, that would help me set up a web socket-based SIP server? Then, when I hit the inevitable issues, I can resolve specific problems rather than trying to figure this all out from scratch? I see the documentation attached to the web sockets module, but many of these docs include stand-alone config snippets with no indication as to how to integrate them into a larger config. For instance, the ephemeral auth module tells me how to set up an ephemeral auth route but doesn't give me enough context to place the snippet correctly in the 900+-line kamailio.cfg, and actually I suspect it wouldn't work anyway since I see nothing about HTTP in the kamailio.cfg. Sorry if I seem frustrated. I'm willing to learn, I've just been handed a jet engine and a few suggested tweaks, but not enough context to know how to make them. :) I'll be learning more about SIP and what role a SIP router plays, but it'd be helpful to be able to bootstrap a server so I can learn by doing as well. I'd just like to provide audio/video communication for a single SIP domain, authenticating against MongoDB and with ephemeral auth so Javascript clients can get temporary credentials. I don't want voicemail, outbound routing, etc. This seems like it should be simple to achieve, but I don't know how or where to start in a way that would allow me to build up. Thanks.