Congratulations on th 501(c)(3)!
Delving into the actual Tax Code citations is a heavy, very complicated way to go. What specific questions do you have about 2055, 2106, and 2522? Tell us where you saw the reference and what you are trying to discover. Maybe we can help.
On sales tax, that process is pretty simple. After all, tens of thousands of entities - tiny or huge - have to be able to understand and comply with the process.
Here's some info for Virgina:
www.tax.state.va.us/
Basically, you just need find out what types of things are taxable in your state, what the tax rate is, and file a form - probably once a year.
It's pretty straightforward.