Liek he said your starting lineup is good, but your bench is weak, bye weeks will kill you.
Im not sure Romo has much trade value, since hes not a top 5 QB, but he does have a name.
Im sure you can get a Freeman/Stafford/Kolb for him plus some depth like KID_A suggested.
LT is just about done if you want to make room on your bench.
Problem is you cant afford trading away a starting spot for depth, hit the FA Pool and hope you find a gem. With 5 only 5 bench players there should be some WR that could be studs come mid season and than you can trade them for RB's, look for A Brown, D Moore, Eric Decker, im sure there others not so deep as well.