Why don't you begin with buying a kit with the excellent EF 24-105 mm? Take say 1000 photographs in different situations, indoors and outdoors, then produce a statistical overview of the focal distances you have used in practice. Did you only twice take a picture at 24mm? Then do not begin with buying a 24 mm or wider lens. Did you on the other hand, take 400 or more pics at 105 mm? Then buy a 100 mm lens AND a 135 mm one.
(Do not steer blind on F-numbers, you will rarely need an F1.2 lens, stick to 1.4 or even 1.8 for a 50 mm and you will be much cheaper of, perhaps enabling you to add an expensive 200-400 mm zoom to your list or a 400mm tele if you are in bird photography for instance. I have a 100mm F2 and a 85mm F1.8 and they're both excellent. And cheap! These 1.2 lenses date from a time when ISO was always low, hardly ever above 800.)
Kind regards, RobPan