depends ...what are the current lows and high outdoor temperatures where you live ??
if nights are a sustained above 50° ..with zero chance of freezing ...
I would start single seeds in peat pots (2x2x2") using medium grain sand or a sand mixture (like Miracle-Gro Cactus, Palm & Citrus Potting Mix)
no need to treat seeds with anything ....
pre-fill each peat pot with sand / sand mixture .. lay in seed - then barely cover seeds with sand / sand mixture
water in ....lay out in sun - without covers .....keep moist - but not dripping wet .... peat pots should absorb water and "look wet" ..... if peat pots look dry - water
seeds should sprout in less than a week
Repot - wait until seedlings sprout 3 or 4 sets of leaves .... peel down sides of peat pots ...repot into prefilled pots ......wait a day or so then water in
pots - adenium do not need a deep pot - the first few years plastic pots can be used ....
repot media - must be fast draining
