@Lyndsey2
any sheet made of polyester/cotton 50:50 will be fine, easy to wash, no ironing and If they are thin (as upper sheet) it will dry quickly.
If you want cotton sheets only, than buy those with elastic corners, but then you have to lift up all 4 corners of your mattrasses every time you change sheets and it is havy work for single woman or if you have any medical condition (bad back, rheuma, arthritiss..)
Jersey sheets are heavy, take more space in washer and dryer and need more time to dry. They don't last long.
But, if you would like to keep your sheets for a while you can make a bed and then iron your sheet on the mattrass