There are almost as many takes on preferable or ideal lenses as there are photographers.
There are also two main schools of thought on what a "normal" focal length should be: Lenses around 50mm or wider lenses around 35mm (a third school likes the convenience of zooms which include 50mm).
But start with the 50mm.... If after quite a while you feel constrained by it, then look further.
About the film being offered: A lot of it seems to be pretty specialistic high-speed film. If long expired, could be practically useless.
Also not B&W.
If you are planning to shoot a lot, you could consider buying a bulk loader and the B&W film in rolls.