How did people purchase Bitcoin back in 2009?

For context, I'm writing a novel about time travel that takes place in 2009. The main character invests in bitcoin when it is first released. A few questions:

1.) How was bitcoin purchased back then?

2.) How did people set up a wallets?

3.) How did people send bitcoin to someone else's wallet?

4.) What would happen if someone were to purchase all Bitcoin available when it was first released? Would it still be as valuable as it is today? If not, how much Bitcoin could be taken out of circulation before it's value was decreased significantly?