[ASM & Hex] [RBY] General confusion on writing events in Assembly

[DeltaCodeMGz]

As someone with an intermediate knowledge of other programming languages (such as lua, C++, C#, etc. etc.) I figured I could grasp asm quickly as I did with touching up on hex when starting my hack, but I am just generally confused on the base functionality of the scripts I have read. I understand the pointers and headers, and I have already edited several dialogues, maps, and sprites with the use of tools and hex together, but I just cannot seem to grasp how to get the ball rolling on editing the events in the way I need to. A brief synopsis on what I am trying to do but can't seem to get down is, add my own NPCs (As in their AI, getting their sprites in the game is easy), change base starting points of characters, change trainers out for customized ones (once again, sprites are easy, can't seem to get their teams to edit properly), generate new events entirely, and get characters to enter scenes and leave after battle (As one's rival would in the original ROM). I am basically building my own game in the engine, using pokered as a base, and it has gone along smoothly until now when I need to actually add in the story elements that will make the game original. I am trying to overhaul all of the gym leaders, the path the player takes and I also can't seem to make it so the player is given a certain Pokemon at the beginning instead of choosing between three, as in this games plot they are given their companion as a gift. Luckily I stumbled upon a few posts, and then even better a video series, by Miksy, and they have given me a base of what I need to do, I have just always glossed over assembly and could really use some advice/ help with how to get the ball rolling. Any bit of help will be appreciated tenfold, I have scoured the forums ROM Hacking section to no avail as most are editing FR at this time.

Thanks to anyone who can help in advance.