This is seeds that have come into the country ( New Zealand ) don't know how they have been handled . They have got a small wing with the seed , I assume I just have to plant them ( in seed raising mix ) and just wait
JM seed can go into deep dormancy when stored dry and can be increasingly difficult to germinate. You have no control over purchased seed so you just have to hope now.
Generally it is recommended to stratify (cold treatment) for JM seed before sowing but fresh seed will germinate with no pre-treatment.
You have already sown seed so just leave it be now and cross fingers. 2-6 weeks should show whether the seed will grow or not.
If no germination try again next year with fresh seed.
BTW there is no such thing as 'red Japanese maple' There are hundreds of different cultivars that have red leaves in spring and many of those retain red leaves through summer. Not all seed from red leaf cultivars will end up as red leaf trees - investigate 'genetics' for more on dominant and recessive genes and sexual propagation.
If you do not get god germination this time feel free to make contact. I have plenty of JM cultivars in the garden and can supply seed from red leaf trees. Whether they grow into good red leaf JM is entirely in the lap of the gods of genetics.