[Callers] Caller's monitor question

Hi friends, After years of calling at most venues without a caller's monitor, and finding life much easier at the occasional venues that did provide a caller's monitor, I finally sprung for my own monitor. Recalling a recommendation some time ago either on this list or one of the others, I bought a Roland Cube Monitor (CM-30). But having read through the manual and looked over the unit itself, I realized I don't know what to do with it to put it to use in this context. I consulted with the sound person for my next upcoming gig, but that sound person (whom I do appreciate for many reasons) has limited sound skills and also wasn't sure. Those of you who know more than me on this subject: Is there straightforward guidance that would help me use this unit as a caller's monitor? Or, did I buy the wrong unit for this function despite having good intentions? Thanks in advance, Jeremy Korr Rancho Cucamonga, CA