Hi Amanda,
You've got yourself a very nice telescope there. Be prepared for some amazing views.
I bought my XT12g after a few years without a telescope, and realised I had to be patient with it. Like any new piece of equipment it takes a while to get used to using it. Along the way I have improved mine with some upgraded bits.
The included eyepieces don't offer a lot of versatility. I think the standard eyepiece is the 28mm which only gives you 42X, so Saturn is going to look tiny with that. It has nothing to do with your 10" mirror what size Saturn appears. The mirror will dictate how much light is collected, and then the eyepiece is going to provide you the magnification. Have you tried viewing with the 12.5mm eyepiece. At 96X Saturn will look bigger.
One of your first extra purchases will probably be some eyepieces and a barlow or powermate, which will make your telescope much more versatile. The 28mm is fine for low power, wide field of view, but you will need some better eyepieces at the mid and short focal length. There's plenty of info and advice here for that in the eyepiece section. Don't worry about the 2 star alignment, you'll be doing that with your eyes closed before you know it.
I've got lots of info about the XTg and accessories and eyepieces if you are interested, just let me know.