What does " you gotta start somewhere" mean? When do I use it?

Here is a sentence from the book The Great Gatsby. What does it mean? And what does "thinning" mean? Thirty—the promise of a decade of loneliness, a thinning list of single men to know, a thinning brief-case of enthusiasm, thinning hair.

Is this sentence grammatically corrent? I'd love for people to buy me books. Is this sentence grammatically corrent?

What does "claim" mean in this sentence? Thirty is not the new 20, so claim your adulthood, get some identity capital, use your weak ties, pick your family. Don't be defined by what you didn't know or didn't do. You're deciding your life right now. What does "claim" mean?

Is the first syllable of "worry" pronounced the same as "war"? Is the first syllable of "worry" pronounced the same as "war"?

what does "what's with" mean? what does "what's with" mean? Here's a sentence. What's with the shifty eyes?

What's the difference between "made from" and "made of"? What's the difference between "made from" and "made of"? There are some sentences. 1. Cheese is made from milk. 2. Books are made of paper. 3. Cars are made of metal, glass and plastic. 4. Cake is made from flour, sugar and eggs. I still can't tell when I should use "made from" instead of "made of".

Are "accept" and "except" pronounced the same? Are "accept" and "except" pronounced the same?

Are "poor" and "pour" pronounced the same in American English or British English? Are these two words pronounced in the same way?What about "tore" and "tour"?