I wouldn't sell the kit lenses yet unless you know for sure you won't ever need them. This lens would have a FOV equivalent to a 80mm full frame lens. It is going to require additional distance between you and the subject to fit everything in. You should set your 18-55 to 50 and only take picture at the 50mm focal length to see if you are comfortable with it. This lens is good but you might not like the FOV it gives.
Thanks for the advice, I will definitely try at 50mm focal length and see if i like it.