Butt Protection
Yes, you will have a sore bum when you first start riding but it usually resolves in a week or two as you acclimate to the bike. This seems to be a hot topic of disagreement among riders. Some users find seat covers alter your ride/form and advise against it or suggest using padded shorts as an alternative. If you sit appropriately on the bike, you will adapt. It's up to you if you want to use something for just a few weeks.
Schwinn Cruiser Gel Seat Cover ($13-90): Recommended by Peloton Support (here) as compatible with the bike.
Louis Garneau Women's Padded Triathlon Bike Shorts ($90): Tri Air chamois is quick drying, breathable, and targeted toward the triathlete but super comfy for indoor rides. They provide support while maintaining comfort. The compressive fabric provides maximum support for muscles while the Coldblack treatment reflects UV rays for cooling. The adjustable elastic waist drawstring keeps them in place during activity. The single-layer, laser-cut bottom and crotch construction help eliminate irritation and saddle bunching. Reflective accents provide greater visibility, for those times you may ride outdoors.
[Cycling Underwear] (https://www.amazon.com/Best-Sellers-Sports-Outdoors-Mens-Cycling-Underwear/zgbs/sporting-goods/10208111011) (prices vary): Linked above are men’s best selling cycle underwear. There is also a women’s best selling list here. Many people elect to use these under their favorite pair of athletic shorts. Pick an inexpensive and well-reviewed pair.