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What do the following phrases mean, take my words; give you my words; man of one's words? I tried to guess their meanings and have written down some sentences. Please check these sentences.

take my words as in you take my words if you don't do that then you will be fired.

give you my words as in I give you my words I will return your money tomorrow in any case.

man of one's words as in I'm man of my words, therefore I can never deceive you.
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All should be singular 'word', meaning promise or declararation.

'Take my word for it'...means believe me (and you need the complete phrase, don't stop at word).

'Give you my word '(not plural words) - I guarantee something...to take an oath about something, make a promise.

'man of my/his word' (again, not the plural) someone who is trustworthy and keeps his promises (when he gives you his word, he will do it).
Comments  
I am not a native speaker, but my understanding is...

take my words as in you take my words if you don't do that then you will be fired.

--> That mean, "Believe me!"

give you my words as in I give you my words I will return your money tomorrow in any case.

--> That mean, I am telling you....

man of one's words

--> That means, man who keeps his words, promises....
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 nona the brit's reply was promoted to an answer.
"I give you that man's money for my use", what does this mean