Hey ladies!
Thank you for all your kind replies, they've been very helpful! I don't know why I've been so afraid to post in the past!
I think you guys are right that 20 miles one way might be a bit too much. I'll be working in New Albany and I'm currently looking at living downtown. I think I'll have a "drive only to work" rule, and with living downtown I should be able to bike/walk everywhere else. I looked up a few bike trails in the area, so I should be able to get some practice with longer distances while I get more familiar with Columbus. Hopefully I can work up the occasional bike commute to work.
Thank you Oakleaf for the links to "consider biking" and "bike league course" and well as the shop recommendations. Looking at them has already made me more comfortable with the idea of riding in Columbus.
Thanks again ladies for your advice, and welcoming me to the community. I'll be sure to update with how things go, especially with my upcoming purchase of a new bike!