We usually don't use a comma after such a short introductory phrase.
how do i become a member
In what exactly are you seeking membership, Dinae?!
Yes, there should be a comma after "Five years ago" in the sentence, "Five years ago, I went to...". When a time expression like "Five years ago" is used at the beginning of a sentence, it is generally followed by a comma to separate it from the main clause. This helps to clarify the meaning and improve readability.