As a novice you have a lot to learn. I would encourage you to find local experienced cyclists and a local bicycle shop to assist and mentor you.
Stick with it and endure the initial discomfort until you get into better shape and master the intricacies of bicycle riding.
There's tons of how-to's online.
This one is a good place to start.
I'm a multi-decade adult cyclist and I watched this video. I thought it was so good I donated a buck to him.
Wear a helmet and ride on-road as you would drive a vehicle. Obey the laws. Be visible, courteous and predictable.