It is not mundane, as it is what you want to do, and you will probably enjoy it a lot. Funny thing is, I actually did not interview. As the first school I got accepted to (MSUCOM) was very early on, and they don't interview. It was my first choice so I didn't keep going on with apps. If your ECs are lacking, then your gap year should be filled with those, and adcoms will be interested in it. But if you have a solid app, they will most likely ask you what you plan on doing during your gap year, and the best is just tell them what you are doing, since it fine
Every state is different. For Michigan you would go on subpass.com and it is pretty self explanatory. It would be a quick Google search for your state. But the requirements are all similar. You would need 90+ credits, get fingerprinted, pass background check, etc. For me etc. was a few quick online lecture slides, and a 2 hour class where you turn in official transcript and ell other required materials. I highly recommend it, it is loads of fun. I think it helped me a lot with leaderships skills. Even though I was pretty good at public speaking, this really solidified it.