Congrats on the new bike, Val. May you have many long and delightful rides together.
In addition to the comments about changing the seat, my suggestion is to give your body (specifically your bottom ) a chance to adjust to the new demands you are making of it. I don't ride during the winter months, so each spring it takes a few rides/weeks before I get what I call my 'butt calluses" . Until then, it hurts to ride, it hurts to sit.......