well a flash is not really going to help your landscapes (unless you intend to illuminate something close by in the foreground). A long exposure just needs to be perfectly still, so using the timer will be fine.
honestly speaking, unless you want to build a big kit of lenses the sigma 18-35 f/1.8 is the way to go. It is probably the best quality crop sensor zoom lens that covers wide to normal.
If you need to go wider get a tokina 11-16 f/2.8 They are made for crop cameras, have top tier build quality and optics. 11-16 is in the ultrawide category for crop sensor cameras.
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