I know this is probably not universal but I usually don’t petition any entity with a specific request right away. It’s like meeting a new friend then asking to borrow their car. I will invite them into my daily morning circle consisting of either the directions (north, East, west, south: Belial, Lucifer, Forneus, and Leviathan… although this could be different for you) or I create a triangle in my circle of the 9 gatekeepers. I just introduce myself and give them an opportunity to engage in whatever way they choose. I always have plenty of resin incense as an offering and anything else I think they would like as an offering. I may employ their sigil, enn, scrying apparatus, etc… though not always. I will receive messages, heightened emotional awarenesses, and often clear visual/physical evidence of their presence. I basically build a relationship with them over a period of time until I feel the time is right to petition them with a request. When done in this way, usually the request is welcomed, especially when the request is in harmony with the desire of the entity. This helps them to bring their desires into physical reality so they are quite keen to help. I always thank them and approach them with respect and honor. If it is someone I wish to work with long term, I will construct more elaborate rituals, usually under the guidance of said entity.