Take on a full awareness/observance of kashrus. Only eat yoshon, cholov yisroel, pas yisroel, and only eat prechecked vegetables from Postiv/Kosher Gardens. Be careful only to use meat from a good, chasidishe shechita. By doing so, you’ll avoid timtum halev.
Take on kabbolos in tznius, assuming you’re a woman. Long, loose fitting clothing, keeping the collarbone covered fully, not wearing shoes that make noise, not talking in public, not drinking from a can or bottle in public, not wearing perfume, making yourself unnoticed, basically. By causing a man to become distracted by your presence is a major aveirah.
Shomer negiah, no guy friends, no watching tv, movies, or listening to secular music are all a given.
Learn lectures from manhigim such as R’ Wallerstein, R’ Avigdor Miller, R’ Yosef Mizrachi, and others.