What should I do first to contact a demon? Summon or evoke?
Invocations is a slight possession, you call the being within you to adopt their abilities or being-ness.
Evocation is summoning and arguably harder to do.
If I want to start making a connection with him, is it better to start w/ invocation?
Well, the first thing you can do is properly introduce yourself as I have already asked you to do. You have now made 7 posts, and opened two topics but have not done as requested. Please follow the rules of this forum and make your next post an introduction. Failure to do so will result in the removal of any subsequent posts until our rule is respected.
Invocation is practiced after you got to know a spirit through evocation. But maybe also when you haven’t a request, and just want to call that entity.