I really need some motivation and help!

I just don't know where to begin in my lifestyle change. I know I need to start now so I can thank myself later and just feel better. It's just that I have NO idea where to start and how to start. My significant other doesn't live with me right now which makes this a little harder because I want both of us to make a change, but I just wanted some people's opinions and ideas! Thank you!☺️❤️