How is life in Jakarta, Indonesia?

Hi,
I might move to Jakarta for work in few weeks and wanted to know what I should expect there when I live
what’s average living expenses like?...is 30000000IDR/yr good enough to have normal happy life in there?
Is there something I should be aware of? cultural difference I need to know about?
I heard it is freaking hot in there…..should I still bring some long sleeves and jackets in case?
I have so many questions in mind..so IF you know anything about this city and have a great tip or site you can reference to… please help me out!!
THANKS