Custom layout for my journal

[sonjajade]

I don't know if motherhood has made me dumber or what, but I can't figure out how everybody gets these awesome custom layouts and stuff!  Can anyone help me out or let me borrow their code so I can just see what it looks like?  Wait... I don't even know how to go about FINDING where to edit the code in the first damn place... 

Is there a tutorial on this kind of thing? 

*pouts in the corner while trying to finish up all things fandom so I can play video games*