The most important question of all, especially by private individuals, is usually:
Can I afford the search at all?
Which information do you need and which is not necessary?
What to do with changes of names in other languages or into Hebrew?
What are the chances of success if the last known address / information is older than 30 years?
What happens when the requested person has been found?
What is the fee if the requested person has died?
In which countries are you searching?
How long will it take to search for a person?
Do you search for heirs?