Made some mistakes, questions about my future?

Hey WSO I was hoping you guys could help me out here with a few questions I have.

Right now I just completed my sophomore year at UC Berkeley, although my sophomore year was kind of a wash.

In high school I was dedicated and worked my ass off in order to get into a good school and I'm lucky that my school is highly rated in all the programs I am interested in (business, econ, stats) but to be honest I kind of fell in the freshman trap and partied a lot of freshman year, rushed a frat, etc. At this point I hadn't really thought about my career other than I wanted to do 'business' and I was just excited to be in college for the first time. Still ended up with a 3.8 although I didn't join any extracurriculars of substance or leadership positions (spring admit so only spent spring semester at Cal.)

My sophomore year I got really sick during fall semester though (contracted a weird virus) and missed a lot of time. It got to the point where I had missed so much class due to sickness that I had to waive the semester, and due to a school policy I had to spend my last semester at community college.
So my first semester was a complete waste even though it doesn't affect my record and my second semester wasn't much better taking easy transfer breadths at the JC and working a retail job on the side.

At this point though my sickness has improved and I spent a good amount of this past semester thinking about my future for the first time. After doing some initial research I know that I want to pursue a finance job, but I'm pretty clueless as how to start working for one or even what specific field of finance interests me most.

At this point I know that I am already behind the ball on a lot of people but the challenge doesn't intimidate me. I'm hoping this past year doesn't jeopardize my future since it was a health issue. I do have the option to forgo this year and stay a fifth year (essentially repeating sophomore year) even though I have enough credits to graduate in four if I want to.

Can someone help me with the best course of action to take at this point considering my circumstances? I will be applying to Haas in the fall and I intend to get a major from Haas and either a minor or double major in stats. First off what are the best books and resources to start with in order to learn more about the industry, specifically a broader overview so I can focus my concentration in the finance field? I have a decent summer job lined up already but what kind of things should I be focussing on at this point? Leadership positions? Networking such as reaching out to professors or fraternity alumni in similar fields? Extracurriculars? Part time jobs? I know my next summer internship is crucial. Really any information would be much appreciated.