So, I bought a reverse adoption portal for a Immortal from Billy at the Pagan Shop, and Amosdeus stepped forward! In fact Billy said that as soon as he put my name out there,Amosdeus responed immediatley and quite loudly that he was interested.
Now I do have a Female Demon from Angel Dark,who works with the Priestess in Poland, and the Demon I have is the 1st born Daughter of Amosdeus and Lilith,could that be the reason why Amosdeus was so insistent and keen?
Also I have read that he is extremly powerful and the most respect must be shown to him!
But once I open the portal with the key word, what do I say to him? Sure I can say hello and tell him a bit about myself, but then what?
I dont want to start asking for help straight away as it seems rude and I dont want to upset him.

I have read amazing things from evocations of Asmodeus, some said that the smell off rotten flesh was unbearable, others said that he came forward with two of his most loyal demons by his side. Now to your question, I read that you should not ask him for something that could have been done by a lower tier demon, that seemed to upset him a bit. But do your research on Asmodeus evocations on google, there is a lot of really cool experiences. Btw: I have no personal experience with him.

Agree with the research suggestion : )

You might want to read as much info as you can, to get to know him, and perhaps ask him about certain stuff that you don't understand, with respect of course.

You can also channel and meditate to the immortal's energy to get used to it gradually : )