Re: Hi! I'm new :)
Welcome to the forum. You've come to the right place for help and advice.
You'll find there is a plethora of suppliers for kits to motorize a bicycle. If I could make a suggestion; read lots here using the Google Custom Search feature and you'll find answers to most of your questions. Type in a key word or words, such as "best kit". If you need specific help there's always someone willing to offer it.
Good luck, ride safe.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"