Dog Training Job - Edenvale, GP, 1609

I have a 1 year old rescue at which i got at 8 weeks old, she is a mix with definate pitbull in her. She is extremely loveable and attends doggy care Monday to Saturday. She is socialized only with the dogs at day care, when i take her for runs at the park she wants to go for every dog she sees. She also does not like strangers so im scared for anyone to pat her other than who she knows. My worry comes that as she gets older im scared she become aggressive ( at the current moment i dont see any aggression in her but i worry for the future). Id like for her to attend training for lead walking (she pulls me so bad and she is so strong) as well as basic obediance.