Hi There,
Just to add to what Craig said, 6.5 should be plenty big for your weight and you'll very quickly find yourself on something sub 6.0, 5.5 - 5.8 with the big wing in around 12knts - 14knts should be lovely when you're learning.
@93kg I'm generally on a 5.8 from around 14knts.
Happy flying,
Dave