I'm not a full time trader, but I can try to answer some of your questions.
1) What sites do you visit?
bitmex.com and kraken.com
2) How much time do you spend on trading?
I'm currently trading the 4h time frame. So I have to look at the charts every four hours for 5 minutes to see if I should enter a trade or exit a trade.
That's the benefit of higher time frames. If you trade the higher time frames, you have a lot more freedom and you don't have to be obsessed with the price all the time.
3) What websites help you build your strategy?
This guy:
http://nononsenseforex.com/has changed the way I trade. I recommend taking the time to test his system.
4) What instruments do you lack for a more precise analysis?
Nothing much at the moment.
5) what is the biggest problem in trading for you?
The huge bitmex wicks. Just kidding.