My biggest recommendation is to get on a computer with MT4 because it will give you access to a lot more options, customization, etc. Even though I've been trading for three years now (and hopefully will be able to go full-time in 2020!) I still do very little to NO trading on my phone because I want to be able to really see what's happening.
As far as indicators, it's all a matter of what your eye sees. I've gone through a LOT of different indicators (including most here) before finding out what helps ME see the moves best. I use a MTF TDI on two different timeframes depending on whether I'm trading on 15 minute, 1 hr, or 4 hour.
Just because something makes sense to one trader doesn't mean it'll work and make sense to you, so don't rely too much on finding "the best strategy" or indicators, go through them and find out which ones work for YOU.
When I started, I didn't get TDI either, so don't use it until you've learned more about what you're looking at, and then you can come back to it later once you've learned more and see if it's a good fit for you.
Here's my default view: Two TDIs, a paid for Supply & Demand (different than support & resistance) indicator, and a few histograms.
