Welcome to Tasmania Rafa, the following is a list of gear used by most locals,in normal seasons if such a thing exists in Tassie.
Wet suits
Winter. 4/3 or 5/3 max
Spring/Autumn. 3/2mm
Summer / 3/2 and occasionally
Board shorts and wetsuit vest
Wetsuit boots are only needed in winter or for protection at anytime of year in certain locations (check the spot guide or ask a local)
Gear
Any time of year a 5.3m or 4.7m depending
On your weight will get plenty of use
Summer
you will need 6m or a bit bigger
To get out in lighter sea breeze (thermal wind)
Spring/Autumn
Can be very windy especially Lowhead near Lauceston a 4m or similar will be needed then
So a van or station wagon with two boards and 4sails (4m,4.7m,5.3m,6.0m) or similar is the ideal minimum gear to sail most wind available

Happy sailing