Naish 10'6" was my first SUP - I'm 75-80kgs.
It was a good board to learn basics on - it's a bit of a barge in decent surf over a couple of ft, but it's still do-able.
The 10'6" goes best in small-medium sized surf, a good board for cross-stepping, nose-riding, heli's etc - longboard styles.... Just put the right input in, get on the tail, be patient & it turns - it goes straight really well!
Paddles nicely on flat water - it's got some good glide