Regarding PPL theory. I do not know many places that "teach" it. Most schools I know expect the student to put in 95% of the effort by reading the study material, then go into school and sit down with the instructors when you come up against something you don't understand.
I'm sure there are ground schools that specialise in PPL theory, but I've never heard of any.
Regarding time between lessons. My PPL to almost three and a half years while working full time. Although I would advise against leaving gaps more than a couple of weeks between lessons, you can't control mechanical issues, weather, double bookings, illness etc. The theory will take you longer than you think (if you do it properly) but it's important to understand it if you wish to proceed on to the ATPLs.
Take your time, enjoy the experience, but don't take your eye off the end goal.