My first attempt at Japanese

Konnichiwa,
watashi wa Jaye desu. Australia kara kimashta. watashi wa yonjuugo Juuichigatsu Nippon eikimas

watashi wa Jaye desu. Australia kara kimashta  ni sundeimasu(you live in Australia). watashi wa yonjuugo(it's your age? then "yonjuugo sai") Juuichigatsu (ni) Nippon eikimas(e ikimasu)

almost...but it's correct just about :)