March Madness finally begins on Tuesday with the First Four games and that means it is time for you to print out a NCAA Tournament bracket and begin filling out your best guesses to who will win the Big Dance.

There are a lot of different printable bracket options available online, but our personal favorite is CBS Sports' version. It is nice and simple; easy to print out; and also the location of a great interactive bracket feature for those looking to run a pool online.

Other possible options that we like include: ESPN, Fox Sports, Yahoo Sports, The Huffington Post, and the NCAA.

ESPN, Fox Sports, and Yahoo Sports all offer interactive bracket features -- similar to CBS Sports -- to fill out your bracket online rather than wasting your company's precious ink while printing out 100 brackets for the entire office.These sports websites are also offering massive prizes to anyone that fills out a perfect bracket. Fox is offering a $1 million prize; ESPN is offering a $10,000 gift card to Best Buy; Yahoo Sports is offering a whopping $5 million; and CBS Sports is offering a trip for two to the 2013 Final Four.

You can also fill out a bracket on Facebook that allows you to compete against your friends all around the world.

It's important to start figuring out your bracket soon as the First Four games begin tonight on truTV. No. 16 seed Western Kentucky takes on fellow 16 seed Mississippi Valley State at 6:30 p.m., while No. 14 seed Iona plays BYU at 9 p.m.. The games will be called by Jim Nantz, Clark Kellogg, and Steve Kerr.

Additionally during halftime of the first game, Kellogg will conduct a joint-interview with President Barack Obama and British Prime Minister David Cameron. Cameron is joining Obama in Dayton for a NCAA Tournament game as part of his three-day visit to the United States.