Demons can be wonderful to work with as well as a pain. Study well before you decided to work with a certain one so that you reduce your chances of being let down or pestered in a manner you would not desire. If you have not actually read the Keys of Solomon I would suggest that you start there first before summoning up anything.
Has a lot of texts that you would be interested in I am sure.
Also keep in mind that summoning to many in the magical community is considered rude and the entity might find it that way as well. Invitation, in my experience works rather well. Though like I said have an idea of what your working with first before you dive in and it never hurts to know how to dismiss or banish it before you call it up.