Don't be afraid to reach out to me or anyone else with any coding questions! That's how most of us learn is through forums, youtube, others, and breaking the engine with some testing code and trying desperately to fix it.
The journal idea is just how in other games have a quest log or journal to keep hold of information. You'll have to make a inventory, or character screen, to hold it and then set it to record certain events when they happen. You'll have to get it to go back to whatever screen the player was on before. It's mostly just a List.
Oo, quest code is different. The clicking might be causing some of the issue. It sounds like it's restarting again each time a player clicks the continue. You'll probably have to make the song play without player interference, or if you wanted different songs, the first song only starting up on one player click and playing throughout the next pages without being attached. You could get it set on a certain page too. Like "Music starts when player hits this page". But, without more knowledge in quest, I couldn't say how to go about it yet.
Of course! I don't mind trading tips, and if you ever need a playtester just send me out a message. You have experience in Quest now, and given the chance, I'll probably start asking for tips myself, plus you write so well! I have experience in coding too, so if you ever have a question I could help or at least point you in the right direction.