Sports injury clinics and physical therapists have provided loads of videos and articles with the stretches you are looking for on the net. However, you risk a tear if you try to fully stretch a pulled groin during the acute stage.
I've had a few slight to moderate pulls. Once I was good to go (that is, after a few days' rest to let the pain/inflammation subside), I usually started back with the adductor (aka good girl) machine. I'd find a weight I could handle without pain for fifteen reps, work up to three or four sets three days a week, then increase the ROM and/or add weight. For stretches, I did lunges and cossacks, letting pain be my guide, always cutting the stretch short of the pain threshold.
Since it's nearly impossible to take adductors out of the equation during leg work (except for isolation stuff, like leg ext and leg curl), be VERY careful when looking for workarounds while you heal. I was able to do partial squats, leg presses, etc. (again, short of pain threshold) at moderate intensity pretty quickly, but if your injury is severe, it may be prudent to let them go completely for a while.
Hope you heal quickly.