I think a 50mm lens is easy to carry around

No jokes, that's a serious factor. Some photographers just quit using cameras because too heavy and you don't feel inspired. Secondly, a heavy camera affects the backbones. So... choose a light camera - modern mirrorless are lighter than older mirror cameras like mine.

a 50mm lens

That's called a prime lens (in contrast to zooms). You can't zoom with a prime lens, but you learn photography faster with it, and it gives much space for creativity as its power to blur the background for selective focus and atmospheric shots is maximum. If you buy a camera, I believe, you must have one good prime (35mm or 50mm - depends on the type of camera too) - they aren't expensive usually, and a qualitative telephoto lens, a zoom (something like 70-300mm), or a telephoto prime (something like a 120mm). I don't think buying the cheap standard zoom (like, 18-50mm), which is often included by default, is the best idea. Better to buy a body (the camera itself) and a lens separately.

a bit boring, so people often add lots of flowers outside

Gardens in England - that's just another way to make streets pretty.