The 2012 NFL Season doesn't get underway for another four months, but you can already start gambling on the first week of games.

The betting lines for the Week 1 matchups have been released by certain sportsbooks.

The defending Super Bowl champion Giants open up the season as 3.5 point favorites at home against the Cowboys. New York is one of 13 home teams that are favored in the first week.

Peyton Manning
A year ago, Manning arguably would have been at the top of the list. It’s hard to put him in the top five with his injuries, but Manning should still be one of the league’s best in. In 2010, he threw for 4,700 yards and 33 touchdowns. Photo: Reuters

Oddsmakers are already expressing the impact they think Peyton Manning will make with the Broncos. Denver is favored by two points against Pittsburgh. That's about a 10 point difference from when the two teams faced off in the playoffs this past season.

Below are the complete betting odds for Week 1 of the 2012 NFL Season. All the point spreads are from the Las Vegas Hilton Casino.

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Dallas at NY Giants (-3.5, 47)

Indianapolis at Chicago (-10, 41.5)

Philadelphia at Cleveland (+7, 41.5)

Buffalo at NY Jets (-4.5, 42.5)

Washington at New Orleans (-9, 51.5)

New England at Tennessee (+6.5, 48.5)

Jacksonville at Minnesota (-4.5, 39)

Miami at Houston (-6.5, 44)

St. Louis at Detroit (-9, 47)

Atlanta at Kansas City (+1, 42)

San Francisco at Green Bay (-6.5, 45)

Carolina at Tampa Bay (+3, 47)

Seattle at Arizona (-2, 42)

Pittsburgh at Denver (-2, 45)

Cincinnati at Baltimore (-6.5, 41)

San Diego at Oakland (-1.5, 48)