Hi Pete,
I connect mine straight to the PA via Output 1, and to a personal stage monitor ( if I need to ) via Output 2. This gives you total control and you can change your stage volume without affecting FOH, and the other stage monitor feeds.
Most PA guys will be totally happy with this.
It would be beneficial for you to run and set up your rack connected in a large room/hall on your own and adjust your tone if you can. It always sounds different in a big room/space as compared to your bedroom and then you can finesse the tone that you thought was always there. I love to set up at the desk itself and listen to the tone as if I was in the audience. If you EQ it flat through the desk to set your tones, when it comes to playing a gig, you can tell the PA Operator to run it flat, and even if he tweaks it a little to his taste, hopefully it will still sound just like you imagined it would.
The other thing is that sometimes PA guys will want to blend a bit of both into the mix, by having a direct feed and a microphone on the monitor. It depends on what they are used to.
Always ask for feedback on how it sounds as well, as you may get some helpful tips.
Mic