If you just want to get off the ground, use auto takeoff for now. Go to the training arena and ask for someone to help you out. There are several little tricks to make it easier.
Usin the keyboard for rudder inputs is rough, especially for the fine control you need on takeoff. I would at the very least use the "combat trim" feature to help with rudder trim while you are taking off (Alt + X), and some models have the locking tail wheel. You pull back on the stick as you start moving, and it locks the tailwheel so you dont have that bad fishtail problem.