Hi Brenda and welcome.
As TwistedThrottle mentioned, it depends on how you want to use it. A 50mm lens will work fine indoors for headshots, but if you are looking for full body images, you might not have enough room to back up and fit someone completely in the frame. Outdoors it would be fine for headshots and full body but not as versatile as a zoom or several primes of different focal lengths.
BUT the advantage of an f/1.4 lens is its low light capabilities and its razor thin depth of field.
Outdoors sometimes longer focal lengths such as 200mm are desired for the compression. Plus when your subject stands far enough away from backgrounds, a 200mm gives very pleasing bokeh (providing you don't stop down way too much).
Ultimately down the road you might want to consider something in the 50-85mm range, something wider such as 35mm - but keep watch around the edges of the frame since body parts can get stretched (perspective distortion) if they are close to the edges, and a longer focal length 125mm to 200mm for compression. If you are going to shoot groups of people, then a focal length wider than 50mm tends to be desired.
So there really isn't one right answer. You need to identify what types of photos you want to do - just headshots, full body shots, and/or group photos. From there you might be able to narrow down your choice.