Landed a (kind of) offer! But need advice on what to do going forward?

Hi guys!

I came from a semi-target school but was fortunate enough to land a 1 year internship offer at a BB as a Risk Analyst just last week. I'm quite confused though about future planning, so I have 3 questions hopefully someone can help me answer:

1) ...

2) ...

3) ...

Thank you guys so much in advance!