Running costs of a bike

Hi! I am 22 (student) and wanted to get myself an open bike for a start, among other things for daily use, because I don’t have a car. I used to drive so smallkrams before, among other things for 2 years Mofa (Hercules Prima 5S ), the last 2 years a large scooter with 180cc in wind and weather… well, now there is something big about it. According to today’s research the Suzuki SV 650 crystallizes for me more and more, vlt also the Kawa ER-5 Twister, since many would like to keep it longer, therefore also prefer the SV 650 because more PS. How does it look like with possible repairs in general? How often do tyres, chain set, oil etc. have to be changed, if you don’t drive like a disabled person? And how suitable are these machines still with slightly increased mileage, for example with regard to shock absorbers or something like that?! Wouldn’t want to get me a machine for 2500, and at the end again to invest the same And before I test one of the parts, are they even suitable for a height of 1.85m? I’m not exactly petite now, but I don’t have the body dimensions of a wardrobe…