I am looking to start learning how to build trading systems. I think I want to start with basic trend following systems, like a bollinger band or donchian channel system, and go from there. I am learning how to use NinjaTrader, and have played around with R somewhat. There is so much information out there, that it is often overwhelming. My question is what resources would you recommend, i.e. books, websites, etc., that would be good for someone who is just starting. Thanks.