As you ride more, you'll find that you are best with (1) sprints or (2) endurance depending on the type of muscles you have (fast twitch vs slow twitch). My experience is that women generally have more endurance than men, but men sprint uphill faster. That's a big, sweeping generalization.

Right now, don't worry about either. Practice spinning in circles, rather than mashing down heavy gears so that your muscles are trained properly. Muscle memory is important. Make sure that your bike fits you properly so that you can more comfortably ride longer distances that will increase your aerobic endurance.

If you're in AZ, you're finally getting into some nice, cool cycling weather while our sisters in the northeast are eyeballing their trainers. Enjoy it. Before you know it, it will be 110 in the shade & you'll have to get all of your cycling in by 8AM.