Linear charts have been used by professional day traders forever. If you want to experiment I'd focus on volume based interval over using a renko chart.
I've become very interested in Futures due to the tax advantages as a U.S. citizen. Jumpstart Trading has a free futures guide for newer traders as well as some great posts. (Loved the footprint chart post, anyone here trade off footprints?) I haven't done their course but here's the guide...
I've been getting into it more and more. I personally am using Sierra Charts with number bars indicator which is the same as a footprint. I highly suggest you do some research on absorption and exhaustion. Here's a good article https://www.jumpstarttrading.com/footprint-chart/
I'm new to programming with MT4 and was wondering how I could cancel a pending order if its not filled by the end of a candle? I'm on an ECN broker so it can't be placed in the OrderSend function. Any ideas would be greatly appreciated.