Congrats!
late to the party, but the advice you've gotten from all the guys is solid.
If it ran, and now does not, could be a few simple things.
If you bent valves, or they're stuck open, turning the crank manually with a wrench over the bolt under the cover on the left engine side will show you. It will be hard to turn at the bend in a valve, more than just ordinary rotation. Also, with plugs removed, you can look into the bores with a light and see the valve move downwards.
Carbs are a science of patience and cleanliness. They can be boiled, soaked in pinesol, ultrasonically cleaned, cold soaked in parts cleaner with the rubber stuff removed first...etc etc etc. A million ways, but the good old fashioned visual inspection of jets against a bright light once removed, carb cleaner, a guitar string probing, and compressed air to blow out wet shellac that's built up is key. I haven't had inner passage clogging but enough guys have had it to warrant at .10 guitar string gently pushed in and spun around wherever you can get it.
But to be sure it's running, remove carbs and use some starting fluid. If it runs with starting fluid and then doesn't with the carbs in, you'll be confident the carb settings or passages are to suspect. Then you can learn how to assess your carbs, how to clean them, and how to move to the next issue.
Enjoy, the fun is learning and gaining the self respect of being self sufficient. This forum is a family. Here, you will learn the detachment (Sometimes referred to as "the zen") that comes from loving something as fickle as a vintage motorcycle On sunny days out with buddies, the bike will love you, but make a much more alert, sensitive and attentive man! Because you will always be trying to figure out what the broad is saying to you! LOL. And when you ignore her, something goes bonk and she stops loving. X(
Drewcifer