Cost of living for an expat

I am a girl from Malaysia and currently considering employment in Phnom Penh and would like to know the approximate cost of living including housing, food, clothing, clubs and pubs, internet and public transportations/or driving around for traveling. I need recommendations on areas to live near Hun Sen Park with convenience facilities around and on where to hang out for entertainments.

I speak fluent English and would Iike to know whether I would face any difficulties in communicating with the locals as I would not want to offend anyone unintentionally.

Any info to share would be much appreciated. Thanks.