Good question Larry. First the breathing.
There are many ways to incorporate breathing and some can get a little too complicated for me. What works well for me and most of my students is this.
When you are ready to draw (bow in a low position)relax (there's that word again) your chest and shoulders down and at the same time let your air out. Do not forcibly exhale, just let your air out to a comfortable level. Now, as you raise the bow to drawing position, your chest will raise and lift as your arms come up, let the air come back in. Again, you are not sucking in air to full lungs just letting it in. Finally as you draw, let the air about 1/2 out reaching that state at anchor. Now physiologically, you should have the shot off in less than 7 seconds. After 7 seconds, the oxygen levels in your brain will start to decrease and we should start over. This timing usually is not a problem for trad shooters but can be for compound shooters.
Now to the elbow. It should not be elevation of the elbow that affects release. Elbow elevation is a function of a correct rotational drawing technique. If you have that, think about the SLIGHT downward angle that the elbow travels form the start of draw to anchor. Think of that motion as a imaginary plane around your spine. At the release, the elbow should continue to move on that same plane and around towards your back. That is the long way of saying that it is not "elevation" but "rotation" towards your back that initiates release.
Hope this helps, if not ask again.