Help an investing noob invest 50k

[joes28]

Ive made about 80k this summer 4 tabling 30/60, and am looking to invest about 50k in something long term. Can anyone give me some advice on what I should invest in? I was thinking of something like an index fund or something like that, but I really dont know what I am doing. So, can someone tell me what to invest in, as well as how to go about doing that.