Seeking help writing scripts for random walk etc.

Hi,
I never used UNITY before and although I do have some background in C I have no knowledge of C SHARP. At my disposal is a script which creates an urban environment in UNITY (basically a ghost town). I was asked to create two additional scripts in UNITY which would enable the following functions:
(1) Random walk. An object in the ghost town (a man or a vehicle) would move randomly in space (until, say, instructed otherwise).
(2) Movement along a path. A fixed path could be designated for an object (a man or a vehicle) to follow and along which to move.
My question is whether anyone here would be so kind as to guide me through this, step-by-step, as I have no clue whatsoever how to go about it myself. I have looked at some online examples but none were helpful enough.
I’d appreciate prompt feedback on this query, this way or the other, Thanks in advance!

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