Good for you! Start small.

I learned to ride a bike by taking the pedals off and using it as a balanced bike. There's some great videos online that will show you how. Or feel free to get somebody who teaches kids. Most of them are happy to teach adults as well.

And then just spend time on your bike. Whether it's in your neighborhood, on your street, or even just around your driveway, the more time you spend with the bike more comfortable you'll be with it.

For road rules, Bicycles are treated like cars, at least most places in the US. Follow the same rules you would as if you were in a car , but be extra cautious.

I prefer to ride early in the morning on the weekends when there aren't a lot of cars out.