I want to add my own video posting (just a link to the video, not actually uploading it) thing into the admin area, just like posting a normal blog post. I can program both PHP and SQL, so that isn't really the problem. I just don't know where to start.
So what page checks to make sure the user is logged in and passes through any other security needed? I might be making this too hard for myself, but want to use as much of wordpress as possible.
Also, what file/function calls the info for the database? I want to make a custom call to the database using it.