new and looking to lose 75lbs

I'm a 38 yo WM, former truck driver and former smoker. I'm trying to get back to my pre truck driving weight (220 lbs) but my current goal is to get down to 250 lbs from 325 lbs. I quit smoking this year and have gained 25 lbs since then. I really need to get myself motivated here. I'm tired of not having energy and being short of breath.