While I agree with the slow roll on of throttle and use of right rudder, the last thing you want to do is keep the tail on the ground for a prolonged period. You want to get the tail into the air as soon as possible and keep it there in while the airplane picks up speed. When the tail is "flying, it moves the landing gear closer to the center of gravity and is much more stable than when the model is in a three point stance. With the tail in the air, taildraggers steer about like any nosegear model.

On some models, I find that adding down elevator trim makes lifting the tail into a proper stance during the takeoff roll better.

Generally, having the gear too far forward makes a plane more likely to ground-loop, if the airplane has this problem you will have great difficulty. Airplanes designed by someone that flys from grass are usually forward of ones designed for pavement. Pick the tail of the plane up. If it is extremely heavy, you will have problems.