ejective stops

I've been trying to find out what ejective stops are, and what I
understand from reading the definitions on the web is this:

to pronounce a bilabial ejective [p_>], one first shuts off the air
stream at the glottis and at the lips. Then, using your tongue, you
build up air pressure and release the lips, which makes the [p_>] sound.

Q1. Is this interpretation correct? Or should both closures be released
at the same time?

If the above interpretation is correct:
Q2. If a vowel follows after the ejective, the glottis must immediately
open again. When I practice this, this invariantly sounds like a glottal
stop, e.g. [p_>?a]. Is this acceptible?

René

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