Im looking to buy a home in Brigantine. If I buy a home for 450,000 and put down 100,000. What would my?

Im looking to buy a home in Brigantine. If I buy a home for 450,000 and put down 100,000. What would my?
monthy payment be including taxes and home owners, Just a rough estiment. Thanks Teri
Source: www.trulia.com

Foreclosed houses?
What is the deal on foreclosed houses...I hear that many are available for a bargain. How do you find out about them? I looked around and saw quite a few in different stages. Can agents help with those transactions?
Source: www.trulia.com

if i buy a legal duplex in brigantine and i condo it into 2 seperate units and sell 1 unit, what happens with
my loan, wont there be a lien showing, does the lender have to accept their duplex having to seperate deeds? if i buy a dulex for 400,000 and put 80,000 down and i sell 1 unit for 240,000? will they let me refinance?
Source: www.trulia.com