Start with a 50mm F1.4 (Sigma/Canon or a 40mm pancake though I like the F1.4 more than F2.
. You can acquire later whatever you think you need. You can also sell it if you find out later that you don't need it. A 24-105 F4 L is also a good start. You can sell it later if you don't need it also without losing much (maybe gain a little bit more if you purchase it as a kit lens).
The OP has already stated they have a 50mm 1.8 and 40mm pancake... I'm sure expect is supposed to be except as it would make more sense anyway, hehe.
Ooops, didn't read much what OP had said. Anyway, 40/50mm focal length for me seems the best focal length to start with. I do around 60% of my pictures (landscapes/portraits) around those length. I'm using a 28mm F1.8 on my 500D and 50mm F1.4 on my friend's 5D2. I've taken pictures for a lot of events just using those 2 lenses that's why they're my favorite. Light, nice IQ and nice focal length.

Anyway, to the OP, just go out and shoot. You'll find what you need once you've taken some shots.