Pet Walker

My pup is a year old she is a mama to 10 and she is food agressive with other dogs and she only barks and growls at other people and dogs but never tried to bite or harm them. I want her out of that fear and I want her to make new friends so I dont have to constantly need to yell over top of her that she's friendly but lippy. Plus any additional training would be amazing because she only knows sit and wait and I want her to learn more but I need help.