I wont' go into dream-sign specifics or basics since I don't think I can really be that helpful in that regard just right now anyway; I think Sageous and Occipitalred are giving good advice here and I also agree with the Occipitalred's conclusion about setting intentions to become lucid from a specific sign,
despite what I'm about to say...
Regarding creating your own dream-signs, from my experience you can indeed "create" or insert "artificial" dream-signs into your dreaming mind and like Occipitalred pointed out they should still follow the rule of not being too mundane and I believe that they should be personal to you and really have some meaning to begin with for you. The only artificial sign I use has a very deep network of complex symbolic meanings to me, despite being a mundane thing for many people around the world.
Anyway, you can, in simple terms, turn a symbol or situation that's unusual in waking life to you and that has some deep or personal meaning to you into an artificial dream-sign. By artificial, I mean that this sign might even not have appeared in your dreams at all until now or was extremely rare. From my experience, the mind will eventually become consciously (and otherwise) focused on this personal symbol for the very purpose of using it as a dream-sign and I'm now far more likely to question reality and what's going on around me when I notice this particular dream-sign; importantly, if I even just
think about my artificial dream-sign I start to question reality and wonder why I'm thinking about it, as I have a few times over the course of writing this out.
And if you want more specifics/details about my own context with artificial signs, just let me know here or PM me.
Although I haven't updated the extra info part of my DJ here on this, I've actually stopped trying to track every single little natural dream-sign I have, so I mostly stick to my artificial one as the only one that is very specific and generalise my natural specific dream-signs into over-arching concepts. This is because I have found over time that my specific and natural dream-signs change and they do this often enough that it feels like wasted time trying to keep track of all of them now.
Instead I now actually try to pay more attention to general contexts that are unusual for waking life such as "seeing a dead relative", this would be a good generalisation of a more specific dream-sign like "seeing my dead grandmother from my father's side". Paying more attention to those concepts and situations that definitely have a "wait, what if I'm dreaming?" feel to them, instead of trying to remember every single thing that
might be a dream-sign, such as a being in a train, seeing a dragon or whatever.
I didn't mean to make my reply so long... I really can't explain anything in short sentences.

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