You can purchase from data vendors, some used to have free API like https://www.quandl.com/, though they stopped offering free data. You can also try https://www.tickdata.com/, https://www.quantgo.com/, https://www.algoseek.com/ plus so many others, these are just but a few of the vendors who...
Maybe intraday trading isn't your thing. You should try evaluating yourself and see which sort of trading style really fits you, that is you are really into trading. Maybe you can do other stuff way better and still make most money out of it:)
Option selling is very risky but it can be profitable if you know how to do it well. I'd advice you to consider trading spreads, you can try writing a covered call, which involves a long position in stock and a short position in option. The long position on stock will covers the payoff on the...
It's hard to get free data, especially if you are looking for intraday data. Good thing is you can get great vendors who have competent offers, maybe you can try taking advantage of this.