Paano mamalengke? Also, tips pls regarding sa food

Paano kayo mamalengke? Like do you plot what you eat for that week? If so, how? Also, this is my first time living alone so pls don't judge me. My friends are worried baka hindi ako marunong tumingin ng karne and whatnot pag namamalengke. What should I look out for?

Pls help a struggling girlie out. Thanks!