You need more time with a coach for the bhs on beam, and way more time with a very capable coach for the Yurchenco. Don't even work lead up drills at open gym, or any other place, for the Yurchencho until you are started on them by your coaches.
I'll give you one fairly general tip for your beam bhs that's often overlooked. Beam is all about balance, your body knowing how to balance, and your body being ready in an instant to balance. Those things can only happen when you have a tight core. As you are standing you need to tighten up your stomach muscles and keep them tight as you sit/squat before the takeoff/jump. Put emphasis back on the stomach muscles as soon as you see the beam, or floor line, and keep them tight during the push from your hands all the way to the landing.
And balance isn't just standing straight without falling because if you're not tight you're really just standing there waiting to fall off.
Start balanced and it's easier to do the skill......