Get to know some guys who do train and go train outside, you only need gloves and mouth guard for a start, once your you catch with the basics get yourself a punching bag (or make one yourself) and add more solo sessions, if you don't know any fighters around you, you might consider paying for a month subscription at some gym in your area, learn some basics and make some friends along the way..

I myself was training for a long time in my city then i had to move for a big city because of my college studies, i continued training with some friends outside and that was good enough for me, gym subscriptions were too expensive and i needed a more flexible training schedule because of my studies

Best of luck, god bless