I think I once read that an analog watch is no good for reality check because they tend to be better at keeping perfect dream time unlike digital watches which are easier to mess up - something about geometric pattern being easier to consistently render than writing or numbers are.

For spotting dream signs think of patterns that may be more subtle, for example a dream sign that is more subtle is if many of one's dreams involve extreme emotions, so then one would be on the lookout for emotionally charged situations, and remember to question reality seriously whenever someone has a reaction that seems maybe too emotional. Or another dream sign could be work places, even if it is not always the same one. One of my dream signs is cars, but alas it is all kinds of cars, and given how often I see cars in waking life, I find that it is too often to do reality checks whenever I see one, which is a shame, because I do have a lot of cars in my dreams.

I seriously doubt that you are the most inexperienced person on this forum. Actually this initial workbook entry already shows how much you have already learned. Keep up the good work! I wish you lucid dream success soon, perhaps even tonight.