I don't know how water-retentive your media is, so what I say is only a general rule-of-thumb.
By their very nature, succulents retain water in their stems, in their roots, and/or in their leaves. The thicker the leaf the more water-retention there is. Therefore, succulents are built to withstand drought conditions. I only have a few succulents and some of them are exactly what you have. I have very well-draining soil media. I don't water mine until that media is totally dry..........desert-like dry. That might be every two weeks in the spring and summer when the plants are growing the fastest, and perhaps every 3-4 weeks during the fall and winter, when growth slows down. My plants get extremely high amounts of natural light and the temperature never gets much below 60F, so they probably grow faster than those grown in most home-environments. But even then, I just don't water very often.
If I were a beginning (succulent) grower, what I would do is follow the above watering schedule for a while. If you see a good many of the lower leaves turning brown and falling off, I would then increase the watering a bit. It is normal for the older, lower leaves to do this, but if it seems that this exfoliation is more than normal, that's the plant's way of telling you it needs more water. What is normal exfoliation? This is something that only time and experience will answer. There comes a point where one simply "knows" that a plant looks healthy and happy as well as "know" when a plant looks stressed and unhappy.
I like what I see in your pictures.
Good luck and keep us posted.
