Congratulations on the new bike.

Soreness in the sit bones when you're just starting out is normal. They will toughen up with regular riding. You may want to shorten your rides a little until they do. The padding of cycling shorts doesn't really help this. It's mainly there to reduce chaffing.

The time to worry is when you have pain in the soft tissue in between. That means that your saddle doesn't fit you or that you're sitting on it wrong. Sometimes you can reposition to get the pressure on your sit bones where it belongs. If you can't, then you need a different saddle that fits you better.

Avoid the temptation to get a gel saddle or gel shorts. They tend to do more harm than good.

Don't feel bad for asking these questions. Beginners don't have much way know this stuff other than to ask questions.

Sheldon Brown wrote/collected a number of good articles for beginners. You may want to look them over:

Articles for New Cyclists

You may be particularly interested in Bicycling and Pain as well as Saddles

Sheldon's site is valuable to know about for any cyclist. Fortunately, John Allen and Harriet Fell have kept it going even though he's no longer with us:

http://www.sheldonbrown.com/