I've had extensive exprerience with day trading.
However, from my experiences, if you are looking for a consistent way to make money, this is not a good way. Unless you have money to burn.
I've had my ups and downs, but overall I have lost around $3K. I don't care to recover from that as I learned my lesson that day trading is best left to brokers and financial analysts who do it for a living. Don't get caught up in the hype.
The problem most people have is they focus too much on capital gains. The way to wealth is actually through cash flow. You want to establish a consistent flow of income (not your job)...and stocks are anything but consistent. Sure,there's days that I made $500 in a day...but then there's weeks that I would $50-$100 a day.
I used to think in terms of capital gains too, but it's not realistic, and at best it's mostly luck or takes too much effort to research to be worth it.
Very very few people consistently profit from day trading. They either have connections or work for a brokerage. Feel free to try it out. It was a great learning experience for me - and I learned that I will rarely touch stocks again. It's all about speculation.
Anyway, best of luck if you still want to get into it. As far as websites...I know a ton, but since I didn't do much other than lose money, it wouldn't make sense to "recommend" anything.
I'd rather be selling stuff online.
By the way, I have several very wealthy acquaintances/friends/mentors/relatives. Per their advice as well, I am staying away from stocks. One of these guys has started and sold many companies. Another one of them is owns a top contracting company in the nation. And another makes around $700K and decided to play around with stocks...but decided real estate is much better.
If you do have money to burn, I suggest buying apartments and condos in pre-development phase and selling them when they are built. If you do your research, you can usually make a nice $20K+ capital gain off those without nearly as much risk.