Certified GKH Gardening Expert
This would depend on the exact type of succulent, but generally you will want it to flower first. Knowing whether it was male, female, or both will be the next step. After flowering you will want to pollinate, or if it is self fertile, then this will skip a step. After, you will wait until the flower drops, and the seed pod swells. Once the seeds mature, you can then harvest them for planting.