Hello, I am new to the forum. I have a few questions on regards to United's First Class experience.

I recently booked a First Class flight from Philadelphia, PA to Costa Rica (Connecting in Houston) and Returning non-stop from San Jose, CR to Newark, NJ. All the flights are first class on their 737-800/900. I saw that some meals will be offered.

I was wondering:
What is typically served on these domestic and international flights?Do I do my check in with economy passenger or is their a separate line?Do I have access to any lounges?Are the planes equipped with wifi / tv's?Anything else I should consider/know?

I apologize in advance for my ignorance and I hope to get this questions answered and see whether or no the money spent was worth it!

Thank you!