Distance is priced into almost every Perth wedding. A Swan Valley reception, a beach ceremony down the coast and a city hotel are three different travel jobs, and a DJ quoting all three at the same number has not read your enquiry properly.
The other thing worth knowing early is that Perth has a smaller pool of full-time wedding DJs than the eastern capitals. The good ones go first, and spring and early summer Saturdays go a long way out.
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Perth quotes carry distance in a way the eastern cities don't. A Swan Valley wedding is a modest drive, Dunsborough or Margaret River is a weekend away with a night's accommodation attached, and the price reflects which one you're asking for. On top of that there are the hours, whether the DJ runs the formalities, and the smaller pool of full-time operators, which keeps a spring Saturday firm. Start with the from-prices on this page and ask every DJ for the total delivered to your venue.
Twelve months out is not excessive for a Saturday between October and March in Perth. There are fewer full-time wedding DJs here than in Sydney or Melbourne, so the same handful get booked across every good date. A Margaret River wedding needs even more notice, because you're asking someone to give up a whole weekend, not one night.
Some do and some won't touch a microphone beyond the odd announcement, so ask directly rather than assuming. In Perth the ones who do MC tend to price it into their wedding package, which can make them look dearer than a DJ who's leaving you to find a friend to do it. Work out who's calling the entrance, the speeches and the cake before you compare two quotes.
A battery speaker and a wireless microphone will cover an aisle on the sand, but the Fremantle Doctor is the real problem. That sea breeze arrives most summer afternoons and it will take a small speaker's sound straight out to sea, so a morning or a sheltered spot beats a four o'clock ceremony on an open beach. Ask the DJ what they've done at Cottesloe or Trigg before, and what they'll do about the wind.
Ask for one total that covers getting there, not a base price plus a number worked out later. If the venue is out of town, that is the figure you actually want to compare.
Perth sunsets are late in summer and a lot of couples plan photos around them. Tell the DJ when you are disappearing and for how long, so the room has something to do while you are gone.
One laptop and no spare is a risk you are carrying, not the DJ. A straight answer about a second machine and a spare set of cables is a fair thing to want before you pay a deposit.