Let's say you will go with ritual option one, a petition ritual.
You will, in demon/draconic script, write out your request in a coherent single sentence, with as little restriction on them as necessary. You will then for a week fully immerse yourself, listen to their enn, write letters to them, make seals and talismans of them, meditate on their seal, draw pictures for them, etc.
You're building a psychic bridge to the demons.
Then the summoning begins, when you feel the presence using the evocation keys, make your request out loud and a license to depart, you can provide offerings later if you want.
You then burn the seal and petition. I would keep an English copy of the petition, including date and time.
If you are a Ceremonial or Solomonic practitioner, then obviously you will be using different methods.
The shem angels can do the same and better btw. But if youre heading toward angels, 72 Angels of Magick is likewise fantastic.
If you need good resources for either team, hit me up and I will hand over titles for you to look at.