Hi Paul
I have had the chance to look at the design and as is usual for Glynn it is well designed and fairly simple to build and sail

Assuming that the rudder and sail servos are working correctly then there is no reason, apart from experience, why the boat shouldn't sail very well.
There are two ways to gain sailing experience, the first is to pop along to a local club and talk to the members who have sail boats.
The second is to research what you can and then simple trial and error and learn by experience (yes it will capsize and crash into the bank but you will learn)
Paul