You sell it by posting a trade on backpack.tf for it. Or you can let someone else broker it as like a broker. Examples are people like Me, Derpy Salesman, or Perp That will broker for you. But its always good to sell it via backpack.tf and say it is a one man history. Make sure that if the guy offers unusuals it will be overpay. If pure only 235, as the unusual you have is very hard to find.
trust me if you just want cash sell it for keys then sell the keys - more legitimate traders buy keys than anything
Damn reminds me when I unboxed my first and only unusual just to have it later get scammed oh well noob mistakes congrats though it looks sick!
I would recommend having any one with a lot of trading experience and LOTS of positive reputation to help you sell it. If you do want to do a cash trade, then you have to get a middleman to hold on to it while the cash is being transferred via PayPal or some other payment type that's similar to PayPal. Or just sell it for pure keys. At that point you could get most if not all the things you want