80% of your body composition is your diet.
This is a very old book, but I have sworn by and seen amazing results from reading the book and following the plan for twenty years. And it's quite easy, and you get to eat.... The right foods and the right amount... And five times a day.
Body Rx https://www.amazon.com/dp/0425186075/ref=cm_sw_r_apan_i_39Q9TCGBEX28BDKMGWS0
Good luck! If you're new, let this be your Bible for about half a year. After that, you'll know enough to do your own thing.
Body Rx https://www.amazon.com/dp/0425186075/ref=cm_sw_r_cp_api_glt_fabc_YYZCBHMNZCSN8KF8ZQ45. used copies are $3.99 (I live by this and incorporated with my training)