I think it's probably too early for you to be thinking about a specialist landscape lens or fast prime at this point. You might actually be better served to find a used 18-55 kit lens, while you learn your way around the camera and glass and landscape technique, and which focal lengths do what.

With landscape shooting, night-time and low-light photography typically requires a sturdy **tripod**, rather than a fast lens with a larger maximum aperture.

And if you want a wider vista in the viewfinder, then a 24mm lens is still not particularly wide, yielding only a 35mm-equivalency on 1.6x crop.  24mm is really only wide on a full frame camera.  The EF-S 24mm f/2.8 STM pancake lens is a good purchase and good quality, but is more of a general-purpose, walkaround, street-shooting lens, rather than a dedicated landscape lens.

The low-cost beginner's ultrawide-on-a-crop is probably the EF-S 10-18. The general-purpose walkaround zoom that goes wide on a crop is the EF-S 16-85.  But an 18-135 gives you a much larger zoom range to work with, and probably costs less than an 16-85 or 17-55/2.8.  So, you need to *really* know what your priorities and budget are going into lens shopping.  Limiting yourself to only the $250 and under fast primes in Canon's lineup may not be getting you what you really want, here.

See also: http://photo.stackexchange.com/questions/8518

and

http://photo.stackexchange.com/questions/50006/why-are-my-photos-not-crisp