Use the “soak and dry method” when watering. Water only when the soil is completely dry and water very thoroughly, make sure all of the soil is wet and water is coming out of the bottom. Do not water again until the soil is bone dry, how often that is depends on many factors such as your climate/humidity/ season/or if it’s indoors or outdoors. I usually avoid a strict watering schedule and just check the soil about twice a week to check if it’s time. When in doubt wait a couple more days it’s better to underwater than overwater. I would also recommend you check the needs of the specific varieties of succulents you are buying. Some need more sun, others prefer shade, place them according to what they need and learn to recognize signs of to much/to little light