Paper 1 is the "fun" exam. It is 75 minutes long and you are given four sources, one of which is always an image of some kind, and you use those sources to respond to four questions. You had similar exams with Tr. Jonathan in 10th grade I&S, so this should be somewhat familiar to you.

Paper 1 is likely the easiest assessment in Global Politics -- getting partial credit on all of the questions usually sets students up for a solid 5, and getting full credit on some and partial credit on others is a quick way to get a 6 or 7 (though getting full credit, or close to full credit, on all questions is the most reliable way to get a 7.)

Paper 1 is the same for everybody - SL and HL. There is no distinction between the two levels.

Well, you simply won't know until you open your test booklet. Paper 1 topics can come from any of the four main units, and there is no way to know which unit it will be beforehand. There are no options are choices: the exam you get is the exam you get.

This means that its important to study and review all of the four units in the course. Luckily, a Paper 1 exam will very helpfully tell you which key concepts are the most useful, so you do not need to spend a lot of time figuring out which ones are the most relevant.