Letters of recommendation for MA or MFA several years after BA.

I graduated with a BA in English in 1997. Since that time, I’ve wandered around the country delivering pizzas. I’ve seen many places and peered into many interesting faces. Now though, I wish to return to the the university and pursue an MA or an MFA in Creative Writing. Writing fiction and reading literature have always been my passions. I wish to take life to a new level. But how can I? It appears that in order to be accepted into graduate school letters of recommendations are required. How am I supposed to get those? Most of the professors who know my work are no longer at the university I attended? They have moved on to other places or have retired. I do not know how to find them. Would letters from a boss or two work? I’ve been published in an online poetry journal several times. Would a letter from its editor work? Any ideas? Thanks.