The Great Gatsby Pgs. 25-36

In these pages of F. Scott Fitzgerald's The Great Gatsby, we learn that Tom Buchanan has a mistress. Nick meets her with Tom. The themes of wealth, are kind of annoying to me. I feel like I've gotten to much of the upper class. One thing that we are told is that Gatsby is a cousin of Kaiser Wilhelm. This makes me excited to meet this mystery man. I wonder what role Gatsby will play in this story, and because the story is named after him, why he hasn't yet been introduced properly. I thought the quote "I have been drunk just twice in my life, and the second time was that afternoon" (Fitzgerald, 29), was fairly humorous. This quote shows that Nick doesn't especially want to be there, and gets drunk. I am wondering why we have been introduced to Buchanan's mistress, and what the story of the book will be.