I'm totally captivated by WLC's Kalam argument! I'm convinced up to the point of evoking the Biblical God.
So the most logical conclusion to me is that there exists a beginningless entity of a deistic kind, that has existed changelessly until, well, the first change. As WLC says: God exists timelessly sans creation, and within time since creation.
The biggest trouble for me is conceiving of anything beginningless because it seems my mind just isn't equipped to handle that. But rationality and logic seem to force that point, so I just have to accept that there is something uncaused and beginnignless even if I can't form a proper mental image of it in my mind.