SCButtercup, Adenium Ko is very reliable and a great hybridized of these seeds. Also, Rinoa from Taiwan is great (Orient Adeniums either on FB or eBay). Kukuan of Adeniumcenter has seed in packs of 10 seeds and is good.
If you are wanting a particular color and form of flower. You would be best to purchase a plant with the one you like. Especially, if you have limited space.
Adenium do not come true to seed.
If you have been starting all thos other seeds, you should not have any problem. Just look at the soil mix and some information on these in particular (Adeniums). Much info on this site to assist.
It is definitely a good feeling to start your own and see it's first bloom, whether it is at an age of six months or 2-3yrs.
I purchased some so that I could enjoy a particular bloom which I knew I would get from seed.
Rick