Hmmmm......where to start?
First off, congrats on buying a very nice first gun. You couldn't have chosen any better.
Second, you really should get some lessons on gun handling and shooting. Easy to say I know, and harder to do.
Anyways, to answer your question, load the mag, insert it into the mag well until it clicks into place. Pull back on the slide until it locks to the rear. Depress the slide release to let the slide move forward. This will chamber your round.
You are now ready to fire. But, please read thru the owner's manual front to back. Pay attention to the photos showing the slide release, safety and such.
Did I mention you really do need to get some gun handling and shooting lessons?