Have you summoned anything yet?
This summoning ritual is not for newbies sorry and what do you mean you need some advice on which of the Djinns is better to summon? If others have to tell you this you are no where near ready to summon Djinn sorry I don't mean to sound rude..
Ask people, read books, check online to learn stuff but if you have to ask people "HOW TO OR WHAT IS WHAT?" you are a newbie..
Try this "Summoning a Djinn" when you learnt lot more about.