I have landed on the grasslands around the KSC and then i tried to get on the runaway, with 10 m/s. You can use with "B" the brakes and you can adjust their power when you rightclick the wheel. You should also disable the brake on the front wheel by setting the power to zero.
I'm a new one, so first hello to the community here. I just wanted to make a sub-orbital flight, which orbit went over minmus, but then i left the SOI of Kerbin, so Bill floats in space. I have decided to make a rescue mission later.