are you going to be using a solomonic seal like that one in your profile picture which is used to summon/invoke the archangel micheal? do you wish to summon demons? angels? spirits? maybe something from the archtypes of goetia?
either way you gotta know what you want to summon and exactly what the cost of summoning said being will be, i can help with the details but you must first help me understand what it is exactly you are after.