As Jesus_Phish said, don’t get too hung up on having a teacher, especially when you’re just starting out. A classical guitar isn’t ideal if you want to play blues/rock solos like the first two you videos linked, but there’s nothing stopping you from playing blues and rock music. If you like David Gilmour for example why not aim to learn to play something like Wish You Were Here as your first full song?
Here’s how I would do it if I was just starting out on my own.
Start off ignoring anything fancy they do and learn to strum the basic chords - a quick google gave me this, which looks about right (the intro with the little solo is just the chords at the end, repeated). If you don’t know how to fret chords this might be of help, or just look at this picture.
Use your thumb to strum down once every beat (four beats per measure), then switch chords and strum down four beats again, switch to the next chord and so on. It’s going to take time, feel awkward as hell and you’ll hate your left hand but once you can reliably switch between chords, congratulations you’ve just crossed the biggest hurdle in learning how to make a guitar sound good.
Once you can switch between chords, try to imitate the strumming in the song with your right hand, still ignoring any melody or other fancy stuff - your left hand should still just switch between chords. If you can learn to do this in time with the song you can start thinking about learning the melodic bits. A Youtube search came up with this guide, which seems rather good. I’d start with the second video, where he goes through chords and strumming and then look at the first which deals with the melodic accompaniment.
If you can learn all of the accompaniment (this will take some time if you’re just starting out) you could consider learning to play the guitar solo bits (watch the third video of the guide above). The solo uses different techniques like legato (“slur” or “hammer”), glissando (“slide”) and string bends which will take time to learn but are very useful (bending strings on a classical guitar is tricky or impossible so you’ll have to use glissandos and/or legatos instead). If you don’t use a pick you’ll have to figure out how to play melodies with your fingers. This isn’t very difficult and I’m sure you can find beginner’s videos for classical guitar that go through it in detail.
Now, you can build on this, for example google “Em pentatonic scale” and play around with that along with the music, figure out different ways to play the chords, different strumming or picking patterns etc. One of the nicer things about learning an instrument is that pretty much anything you learn will be useful elsewhere. Sooner or later you’ll probably want to learn some theory but until you want to learn something that requires it don’t bury yourself in sheet music and theory books. Whatever you do, don’t play scales for hours on end unless you’re trying to learn something specific - play music you like. Getting familiar and comfortable with the instrument while having fun should always be top priority when you start out.
Well, don’t know if all that was helpful, but perhaps it’s given an idea how to start.