Good one, I hope it works out.
On enclosed waters ( Bay & Gippsland Lakes ) you only need PFD L50
Kids don't like to be different, the "cool" pfd's at the moment are the Zhik vests
some on clearance here:
www.monkeyfist.com.au/c/4507593/1/buoyancy-aids.htmland ever popular the Ronstan one here:
www.whitworths.com.au/ronstan-dinghy-pfd-level-50For Adults check out the Bourke or Marlin ones at Whitworths, you really want to go in and try them on and see what feels comfortable. What works for a guy may be uncomfortable for a woman.
While you are there you can get a couple of other bits and pieces. If your new boat does not have a tow ring on the bow get a shackle and ring to lead your painter through, for tying to a dock and to a tow line if you need to.
Also check out the roll top dry bags. they have a clip to close that you can clip to the boat so it stays with you.
teltales, a bit of stickyback and wool tufts on the sails for getting your trim right and some cassette tape on the shrouds for wind direction
Bailer you can just cut a milk/juice bottle on a slope and tie it to the thwart.
Your pacer has a pivoting centerboard. At the top-front will be a pair of rubber door-stop things. A length of reasonably sturdy bungy cord in two loops around the thwart and long enough to go around the door stops will hold the board down and allow it to come up a bit as you grind it into the beach.
Rowlocks and oars may work, you would probably need to do a little woodwork to the gunnel to fit the rowlocks but it is doable. More fun would be a little trolling motor.