Congrats - you'll love it! I use an old LPL colour head enlarger but print B&W. Dedicated B&W heads seem to be less available and more expensive - not sure why... The colour head does just as good a job once you get used to setting the contrast up. Make sure your enlarger has a red filter to swing in front of the lens.
Don't buy a cheapy enlarger - it'll just frustrate you - the stem will wobble about every time you try to change the contrast (be it dials or a filter drawer) which makes split printing very hard to do.
Oh, and you'll need an 80mm lens for MF - the standard 50mm lenses are for 35mm negs.
It's totally addictive but I tend to do most of my printing through the winter when it's cold and dark - rather be out and about on the light summer evenings