Ok, so, after a week of non-stop work in the real-world so that I can pay bills, I haven't managed to get too far, however, I think I can tell a few things about where this might go:

July (northern summer, southern winter)




January (northern winter, southern summer)



It looks like there might three monsoon zones, a troipcal monsoon on the eastern coast of Mistaya, a temperate monsoon on the eastern coast of Arenda (both in the northern hemisphere) and a second temperate monsoon on the far eastern coast of Sirden (in the souther hemisphere). There might be a fourth on the east coast of the large island to the south-west of Hungas (which looks like it could border a temperate or a tropical monsoon given the latitude).

If this is all roughly correct, my next step will be to use a method suggested by eternalsage here (post 28 of the thread) in order to set up precipitation levels. You can already probably guess some trends, e.g. the southern interior of Arenda and several areas of Sirden will likely be deserts, but I can't be any more specific than that right now