You will be short by about $3000 per month not allowing for any entertainment costs, endorsement repayments, CPF, car.
You will need a Captain's salary to get by, don't think about getting rich as those days are gone.
Don't even think about putting your kids in a local school unless you plan on staying in Singapore for good.
The rental market moves more than the stock market in Sing. Expect your landlord to double the rent whenever he can.