support beams

I RECENTLY BOUGHT A MODEST CAPE COD WITH A LIVING ROOM SIZE OF 10'X10'. IWOULD LIKE TO REMOVE A LOAD BEARING WALL TO CONNECT ANOTHER ROOM 10'X10'TO INCREASE MY LIVING ROOM SIZE.THE WALL IS IN THE CENTER OF THE HOUSE WITH OUR BED ROOM RIGHT ABOVE IT. I'M LOOKING AT MICRO LAMBS OR A STEEL BEAM.ANY HELP WITH THE PROS AND CONS OR FORMULAS TO CALCULATE THE CORRECT SIZE WOULD BE VERY APREICIATED.