Moving to Australia visa options

I will be joining my Australian boyfriend in OZ January 2025.  will be living on his sailboat with intent of marrying and living there.  i am looking for suggestions as to best option to take re initial visa to get to make initial ”landfall” from  anyone who has been in a similar circumstance.  Am thinking  , hopefully, to get at least a 6 month visa and reapply once there.


I am a retired oceanographer and now artist/photographer/writer.

Karen