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Zumaray said..
An 8.5 sail sounds pretty big. Would this be for very light winds, under 10kts?
At 100 kilos - under 12 knots i use a longboard with an 8.x sail
at around 12 knots i use a 10m2 sail with a 170 liter/93 cm FreeFromula
at around 16 knots i use an 8.x sail with a 160 liter/80 cm freeride
at around 20 knots i use a 7.x sail with a 124liter /63 cm freeride
at around 23 knots ....
you get the picture

if you start with the 8.x sail and 160 liter board in lighter winds, you will not be overwhelmed and still have FUN
what you can do - is take some lessons and see which equipment they have will suit you to start back
don't make it too easy, as you may progress quickly !!!