Well, let me try to find a tutorial. I found a few:
Tutorial 1 (English)
Tutorial 2 (Spanish)
I haven't read these, but hey, they're tutorials (Documents). If you need any help, PM me.
EDIT: In order to patch something that's IPS, you'll need:
A Fresh SMW Rom (Don't ask for it.)
Lunar IPS (In the Tools section.)
The Patch you're going to use. (Well... the patch you're going to use.)
First off, open up the Lunar IPS Program. Get to the directory where the patch is, and select it. Next, I think you patch it to your ROM (Back up your data in case.)
If you need to patch something with XKAS, I'll just say it later... I'm a bit tired.
Umm... for the Boss Fight, I don't think you can copy Reznor. For the events, you'll have to go into the Overworld Editor. Also, I believe you can't copy a Cannon Render stage, or it'll appear screwed.