Distance behaves differently on this side of the country, and it is the first thing to get straight. A booking in the Wheatbelt or down past Bunbury is not a long drive by Perth standards, it is a whole day gone plus a bed at the other end, and the group cannot take another job that weekend. Say the town in your opening line so the reply is a real number instead of a placeholder.
The pool of groups here is small, so treat it as a handful of people to write to on the same afternoon rather than a queue. Ask each of them how many players they would recommend for your room, and ask it as an open question, because a smaller configuration is often both the cheaper answer and the better one in a shed with no stage.
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Regularly, though the questions change once you leave the highway. The ones worth asking are what time they would want to arrive, whether the last few kilometres are gravel, and how the power is getting to the stage. A group that brings all three up before you mention them has done this drive plenty of times.
Country holds up better than most genres when you take players out, since the songs were written around a handful of instruments anyway. What shrinks is not the energy so much as the range, because a few of the modern numbers really want an electric guitar and a kick drum underneath. Ask the band which songs come out of the set at the smaller size and decide from that list.
It depends entirely on the age spread in the room. The contemporary end sits close to pop rock and will get a younger floor dancing without much effort, while the older material is slower and better suited to a long afternoon under a tree than to eleven at night. Tell them who is coming and let them pitch the balance.
Nothing on this page carries a visible rating, so ask for unedited footage and watch the floor rather than the stage. Then send every group the same pair of questions, how much they worked last year and who covers a player who falls ill, and read the answers side by side. Vagueness on the second one tells you more than anything on a profile.
Outdoors on a property there is usually nothing to plug into where the vows happen, and a rig built for a function room is no help there. Ask specifically whether the band owns something battery powered for that half hour, because owning it and improvising it are very different things.
Calling dances is a separate skill from playing them, and only some groups do it. Say it plainly in the enquiry along with a rough guest number, and anyone who calls will come straight back with what they need from the floor and the microphone.
Once you are a few hours out of the city, nobody is driving back after midnight and everyone knows it. Work out where the players sleep while you are still discussing the booking, not in the fortnight before, when the local accommodation has already gone to your guests.