Hey Reed. Welcome to the forums first off!
As for the transactions go, every time an "order" is filled whether its a buy or sell, it's $7. $7 per transaction. Say you buy 100 shares of stock XYZ, that means you pay $7 each time you go through the broker to either buy or sell.
Hopefully that makes sense. Do you have a scottrade account Reed? I actually have 4 accounts through scottrade. No complaints thus far and it's been about 2 years now.
Good luck in the future, hopefully we'll see ya around!
All the best,
-Spence