be nice to the noob guys.

EMJ:

Yes you can keep your front wheel.

700c is a rim size, not a hub size.

For reasons that make no sense "700c" actually refers to rims that are 622 mm in diameter. I don't think the "c" stands for "centimeters" or anything like that, it's more wacky and arbitrary than that.

Get a 700c fixed rear wheel for cheap at bicyclewheels.com and have fun learning more as you build up your conversion.