I would love to hear at least the basics for a non-US/Canadian citizen: 1. you get an interview with YC, which visa should I get? B1/B2? purpose of travel? 2. y

I would love to hear at least the basics for a non-US/Canadian citizen: 1. you get an interview with YC, which visa should I get? B1/B2? purpose of travel? 2. you get into YC for 3 months, again, what kind of visa? purpose of travel? 3. you get +$1M in seed round, how do you stay? 4. you get $5M in series A, how do I live there? Thanks!