g'day pootle
mate we are doing the same thing down in the fremantle area
as the other turtles say do your roof first,you just do not want it letting you down when it's pouring rain for weeks on end
also sort any damp or structual problems first then you will have a good base to start with
as to paint,buy good quality stuff and prep really well
the rest ,,,, i'm sure your better half will let you know what order to do them in
good luck
pm me if i can be of more help