Biggest tip if you're just starting out and dont have much resil go for SP, Pen, and a bit of hit. Then pop everything you can as fast as you can and try to drop one early, if you get the chance recover, CH while bloodlusted to top all guys off while you find your next victim is a good way to do it. If you can get it to 5v3 you should win.

Another method is run out with an alt as the leader so they focus that one, he'll be your sacrifice while you kill one of them, this can be tricky because you need to kill something and pop a heal before they kill your guy. It also doesn't work outside of the starting bracket really.

If you can clear the I just rolled this team last night people, you'll find much better matchups and true competition not just flavor of the month type stuff. But really it's a lot of practice practice practice, and a ton of patience and a touch of tweaking your style to be competitive.

Videos help but there's nothing like trying for yourself a couple hundred times, that's where you learn things that work specifically for your setup and style.