I'd also buy some toeclips. You should be able to find some for $10 or so. They'll help you pedal more efficiently.
Not as good as modern "clipless" pedals, where a cycling shoe locks into the pedal, but fine to start with.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.