You get drafted. This means that a team comes over, watches you play, and decides whether they want you or not. There aren't any requirement to be in the NBA, just team requirements when they draft you.
Jon Diebler is the 32nd ranked player in his Sophomore class. The NBA drafts five rounds, 30 picks in a draft. That is 150 players drafted a year. That means Jon's senior year in college, he could EASILY get drafted to the NBA. Peace nukkas!
No, but Oakland does. They are the Golden State Warriors. Actually, because Oakland is part of San Francisco Bay Area, that means yes, San Francisco does have an NBA team called the Golden State Warriors
It is far less than 1%. There are roughly 900 teams in college basketball, with an average of about 12-13 players per team, not included inactive players, which means over 10,000 players per year. There are roughly 360 active NBA players. The NBA is for the truly elite.
In basketball stats, PF means "Personal Foul". PF also means "Power Forward", a position on a basketball team. If you are looking at NBA standings, PF means "Points For", or how many points a team is averaging, and PA means "Points Against", or how many points they are allowing.