50mm is generally a little tight for classic street photography, but it’s fine to get started (27 to 35mm is the sweet spot). People will argue endlessly what counts as street photography, even though it has a clear definition: candid moments on the street involving people. A cityscape or car is not street. Two people laughing at each other is street. A closeup of an interesting face is street. A person aware of being photographed, posing for the camera, shot with a blurry background is a street portrait. Get close (your 50mm makes this a bit more comfortable, but you get a different look). You generally want at least f/5.6, but ideally tighter aperture so you get most things sharp. Good luck!