I will not help you to learn the champ, I'm here to help you to understand what do you need to change with this different build.

You can ask in comments and i will try to help you as much as I can

Same as common Aatrox, till mythic, when you can start watching why do I choose this Runes and why Eclipse is a match in heaven for Aatrox, you activate it too easy, putting you extra shield and using the rune <Shield Bash> a lot of times to increase your damage.

With this build you need to have a little bit more of care at least if you have 2/2.5 items(No counting boots) With 3 or more you can do the work easily.
Go inside all of them, with this build you have a lot of damage and heal and you can tank them a lot cause you have Death's dance and combined with the R reset you can literally destroy all of them getting just one of them first, but you need to take this ome, without it you can die relative quickly

Now you are tanky, run with your team and kill all of them, youre an Aatrox but with more damage and speed than the commonly played cause you have a better mythic for damage and that item heal you too