My recommendation would be to start out in Briggs LO206.
You stated you had no budget, I am assuming, since you said the budget was ‘none’. Briggs LO206 is among the most affordable program in karting, and teaches you the basics to help you to progress to the faster, more technical categories.
GoPro Motorplex has a Briggs LO206 program at their track. Not sure if NJMP does.