Peat moss will get too hard/compact after a while. I start my cactus with 33/33/33 (and 1% of love) blend of miracle grow potting soil and perlite and pumice.

I strongly recommend adenium seeds. They are easy, fast and very cute as seedlings. Often, they bloom within a year. You can go over to the Adenium Forum (which I often think of as being next door) and ask the fantastic people there if they have seeds to spare (they usually do, a seed pod will often yield upwards of 80 seeds).

Most other succulents are really not that easy to grow from seeds, especially if you're going to use randomly-sourced seed mixes whose age you can't ascertain.

No vermiculite, it'll quickly disintegrate into a glittery mess!

Pagan, I love growing Adeniums from seed! They are super easy and also do well hydroponically. I use to spend a lot of time on the adenium forum under the name "Bob" the older hydroponic seed starting threads are from me. I also love growing fockea edulis from seed, those are some fun seeds to start. On eBay Ko has some really great seeds. I prefer growing the different arabicums and socotranums! I've also bought many adenium seeds from http://www.adeniumseeds.com

Ive only ever had some luck with lophophora seeds other than that in the succulent/cacti category. I tried sowing a flat of mixed seeds that someone gave me after ordering them off of eBay and then finding out how hard they were to grow. I didn't have much luck with them either though. My lophophora's are down in Coarse horticulture sand from EB stone, and kept in a closed humid container for the first few weeks of their life.

Ill look for some of my adenium seed threads to post and if you are having kids sow them I would also recommend Adeniums. What usda zone are you in Howard?

If it's your first time sowing I would go with a mostly inorganic medium, avoid lava rock (as seed roots can get tangled and stuck inside the holes).

Some of the easiest things to grow from seed are :delosperma, glottiphyllums, anacampaseros, cheiridopsis and phyllobolus! The first three can be sown in late summer and not fussy the latter two need some cooler temperatures but all are easy IMO. Good growing!