Shaggy Sheep Driver,
You don't use a specific rotate speed at Barton because it is a soft field and you want to get airbourne at the lowest practical speed to save the landing gear (and the grass).
This is lower than the specified rotate speed for the aircraft but only provides sufficient lift whilst in ground effect. That is why you level off a bit to accelerate to the normal climbout speed before climbing higher.
FFF,
Don't worry about the flying from the right, after about 5 hours you will find it hard flying from the otherside. For example, one of the instructors at the school I work at was giving a trial flight and thought that that something didn't feel right but couldn't put his finger on it until he realised he had sat in the left hand seat
