I usually travel with United or American Airlines, they are big American flight companies so there are usually fewer complications when lighting to the U.S. and it is very helpful if you don't have experience traveling.
And about the online company, I book all my flights through Kayak.com. They usually have lower prices than all the other websites. They also have a very easy checkout, so it makes booking a flight not different from buying anything else online.
I usually travel with United or American Airlines, they are big American flight companies so there are usually fewer complications when lighting to the U.S. and it is very helpful if you don't have experience traveling.
And about the online company, I book all my flights through Kayak.com. They usually have lower prices than all the other websites. They also have a very easy checkout, so it makes booking a flight not different from buying anything else online.
Good Luck!