Ending a sentence with "For instance"

Hello guys..
I have been trying to find an answer to this question, even though I know it's easy, I couldn't find any definite answer for it...

I'd like to know which punctuation marks should be added to the following sentence:
You can be a good person by being honest for instance.

Should it or should it not be like the following sentence?
You can be a good person by being honest, for instance.

I do not know whether or not should I add a comma before "For instance" because I usually use it at the start of the sentence, but I had to use it at the end of my sentence in my essay for today..

Answers will be appreciated .. thank you very much for reading:)