So I just got this Fujifilm X-Pro3 and honestly its kind of intimidating looking. I saved up for months because I love how it looks but now I realized I dont actually have a lens for it and I have no idea where to start. I'm sorry if this is like a super basic thing but I'm a complete beginner with cameras. I mostly want to take photos around Chicago when I go for walks and maybe some nice shots of my cat at home.

My friend told me to get a prime lens because they are sharper? but there are so many numbers everywhere. I see stuff like 23mm or 35mm and then there's the f-stop things like f2 or f1.4 and it makes my head spin a bit because I dont know if the bigger number is better or what. I have about 450 bucks left to spend on a lens before I go on a trip to New York next month and I really want to be able to use the camera by then. I dont want anything too huge because the camera is pretty small and I dont want to look like a pro photographer or anything just a hobbyist. Should I get a wider one for the streets or something more zoomed in? Im just really lost on which one would be the best all around starter lens for someone who literally knows nothing about how focal lengths work...