Getting back on topic of learning to windsurf, which is what we're all interested in!
If you a are a rank beginner, a big board like a SB Go or equivalent (100cm wide) with centre board and a small battened sail will have you progressing the fastest.
We've had a couple of the girls in the group start lately and we were quite impressed how quickly they progressed on this type of gear.
The big board allows you to concentrate on sail handling technique without having to worry about board balance too much. Once you get the feel of the wind and you can use the sail to help you balance then you can start concentrating on board skills and smaller board. Also centre board keeps board tracking straight with smaller sails.
We have started them on a 3.5m wave sail.
1. because it easy to up haul out for the water, 2. It's light and handles a broad range ow wind conditions. The were both 45kg girl, with your height and weight you could probably go around 4.5-5m. See below, our learner sailing confidently after a couple of hours on the water.
However if you have progressed pas the basics then a wide freeride board around 125L & 5.5 sail would be the go.
Maybe you could tell us a little about your skill level.