Thats a way long journey mate and all you have to do is start looking for the exchanger or market place that you will be using or you are comfortable with. After selecting the market place you have to go for choosing your coins and/or tokens that you gonna trade. Mostly you should choose the undervalued coins at the first time which are nothing but the coins which are below $1 in value but make sure they are having the higher 24 hour volumes so that they wont be scam ones. The more the market volume the better it is.
Now start selecting your best methodology from swing trades, day trades and short-long term trading etc. This way you can start learning about the trades.