Quote from dom993:
Spend $750 & buy CL entire history from TickData, or spend $1300 & buy 30 year-symbol (you only need CL since Jan-2007, before it wasn't trading on Globex 24/7, so that's 6 year.symbol used just there, you can add ES & 6E since July-2003 - before that, timestamps do not include the second, so they are no good for anything below 1min-charts, and you still have "room" for a few years of another market).
Download NinjaTrader, simulated-trading edition - free of charge.
Learn C# - start using your historical data to search for recurring "patterns" - the elusive edge - when you have found your 1st solidly recurring pattern, program a strategy in Ninja, learn to backtest, review in details every single trade result out of backtest, when that seems good, do the same using market replay, when that seems good, do the same, on your broker simulated account, when that is good for a few weeks or months, you can go live.