Caloric Deficit : Eat less than what your body burns, but make sure the deficit that you create is not too big.
Protein Intake : Should be moderately high at least. Protein helps you satiate and maintains/builds lean mass.
Resistance Training : Can be done either via weights or bodyweight, just make sure to provide enough stimulus to your muscles.
Cardio : Do not do excessive amount of cardio, which makes it difficult for your body to recover or shoots up your appetite.