Someone can write this for me if they'd like. Just giving you the build and going to give you the combo.
First off the combo is pretty simple but only really starts to work well at level 5 since you're going to be pretty squish before then. Once you get items though you can pretty much fight with no fear.

First dive with your Vault (E), followed up with the Blinding Assault (Q), from here just autoattack and when they are under 1/2 hp hit your BotRK active. If they start to run hit the ulti Tag Team (R), chase and Ignite. It's really that simple.

The challenge you're going to have is if something is in front of you when you try to hit Q and it doesn't blind them. You get 1.5 seconds with this and they will remain marked since you vaulted them (which also lets you escape J4 traps). So if you miss blind you have a good chance of dying.

Taking into account for armor this is what I'm figuring.

The build order is VERY important so is skill order. You're banking on Attack Speed. By the time you get core items you should be at 1.75 or so with around 200 damage which just in autto attacks is around 375 base damage a second. Your marked passive at this time should hit for about 250 damage also giving you a first hit damage of around 450. In game with armor and all this will be around 250 damage a second with marked damage around 100 or so.

So if you follow the order you should end up doing a minimum 355 damage level burst, followed up by about 250 damage or so a second. Hitting BotRK will hit for at least 115 damage. Basically giving you that burst 700 damage in the first 1-2 seconds minimum. Add the Executioner's Calling passive giving the Grievous Wound preventing healing and popping ignite when they're low lets you refocus on someone else.

To put it simply I can take down a fully nomm'd up Cho in about 7-8 seconds from full HP with Warmogs.