I've come across London Academy before. I haven't taken their course but they look respectable and a decent choice in my opinion. I took a job as a futures trader before and the course that London Academy offer looks almost identical to the training I got on the job. So I think it's pretty good...
You are never going to find a coach who will give you the exact rules to profitable trading because they do not exist. At least not on a short term timeframe.
Financial markets are dynamic, constantly changing and extremely efficient. They are dominated by machines and other trading systems...
Interactive brokers works fine on Mac.
But some of my favourite software is only on a PC. For this, you can easily use Parrallels software to run windows on your mac.
Parrallels is good but in the end I bought a cheap laptop to run my PC based software.
StockTwits is excellent. I'm currently looking at a strategy based on the StockTwits heat maps, it's good for identifying the stocks that people are trading.