First...congratulations on losing that weight. That's impressive and represents an ability to control your destiny. A valuable trait for cycling as well as life. A couple things to consider. You may be tempted to diet while on the bike. Don't. Your nutrition needs during cycling will be different than the routine you employed to lose weight. A book like this (
https://www.amazon.com/Cyclists-Food.../dp/0971891117) will help you to understand your cycling/nutrition needs. Be patient with your progress and enjoy the ride. Try to learn something on every ride. You will learn about your body, the bike (things like cadence and proper shifting) and the environment (everything from climbs, descents, paces and wind) and how your attitude changes from ride to ride. There's so much to learn and it all contributes to your sense of well-being. Have fun.