How to get started as an incoming freshman?

I will be a freshman at Georgetown University this fall. I would like to get a head start on the whole recruiting process for ibanking before arriving on campus so I’ll have less to stress about during the school year. I was just wondering how I could boost my resume before the app deadlines for big banks like JP Morgan arrive in November? So far on my resume and cover letter, I can only include things such as Editor in Chief of hs newspaper, tennis team captain, etc. Is there anything I can do within the first 2-3 months of college to gain experience?

Also, besides the resume, cover letter, and interview, what else does the app entail? Letters of rec?