I want to be leaner and healthier and lose wieght, can you help?

hi, my name is pete, im mexican american, come from 2 full blooded mexican parents, weight 335lbs and and 5'11 in height. being the new year i really want to most importantly feel better and look better by losing Weight. i want to do it the healthy way also. if anyone can give me advice on how to do this. it would be greatly appreciated. my goal Weight is 180. i know that's a big stretch but i know i can do it with a lot of devotion and self control. one thing that is worrying me is how the result will be. ive heard horror stories about sagging skin. is there any way possible to avoid this? or limit it? i am very sedentary what sports can i play that will help be lose Weight healthy? should i be toning up while losing Weight also? thank you so much for your help.