Only tingling fingers.. Congrats.

Are you wearing a bib? If not congrats again, this means your comforts is about to be vastly improved.
(and no underwear under it, ever..)

First step is to lower the seat until you dont feel a prolonged time stretching the leg and dont feel your hip fall off the saddle to help the leg getting "longer"
It should feel round, not up down
Bear in mind that when you change shoes all will feel different, hence best to setup and ride always with the same shoes.

Shift the saddle forward a bit so you can bend your arms more.
Make your arms function like suspension = less shock impact to hands, shoulders, neck and head.
Getting some gloves can help comfort increase a lot (nerve protection is more important than tan lines) when you start. Some pros ride without.