I'd ideally make a game, contract, and program out of my 3 Wishes. Asking how long do I have to prepare the Wishes. I would try to find out the reason the grantor has their power set and basically ask them what they are getting out of it. From there any number of things could go down but after some small preamble with the grantor and their association backing the grantor...
Given that ________________ (immortals grow bored, I have been really good and karma needs to rebalance, and/or some ostensibly benevolent person in the past enslaved the poor grantor/some evil person wants to see me make a terrible wish etc.) reason for the grantor to be able to make real my desire. Look back across my entire life's history and project from now to my life's natural end, compile listing of my best ideas and cross check them against good ideas from all previous persons granted a wish, add in your own wisdom on how best to word wishes previously granted as to their spirit,
dedicate some small resource to compiling the best ideas from all persons who know about "wishing" and all people who have never known of it and lamented their dull mundane existence. Dedicate resource such that all wishes that Definitely Will cause a net positive of Evil and Pain (given that some haters will feel some small pain regardless of any wish I make, small consideration for the unharmed hater) will be considered a nullity and performing as you assume I would perform
again attempt to grant all wishes previous. Such that all previous wishes became real but were a result of ONE wish especially be it that of a previous maker, thus preserving my first wish. All of the wishes that would have have been made constitute merely you and your associate's conversation with previous wish makers.
Now that you exist in a deficit of wishes granted presently, which I will be glad to relieve you of. Make all wishes except the ONE wish correspond to a monetary, power, difficulty level, karmic balancing system such that all limitations you or your associate's have may be taken into account, though you should make your least powerful wish grantor a scale. Many people are foolish enough to wish for a sandwich or may need water or air to breath. Have the weakest wish grantor operate like a reverse ringer and give the maker what they asked for, freeing the more powerful to grant my First Wish and some of my most significant next few wishes. Reverse ringer should appear the same as the original wish grantor for the wish maker. If you have a way or even a desire to protect the relationship between wish grantor and wish maker do so at your leisure and as a "tip" for granting my First Wish. I do not intend to ruin your fun.
Now that I am earning wishes left, right, and center. I wish that I can be given a customizable and amicable user friendly system to keep track of my wish money and that we, wish maker and all other wish grantors especially the one before me now can associate even after my wishes are supposedly and/or temporarily up. Though I should also have the ability to block wish grantors etc. I will try to be funny but probably some of you are not so fun or funny. Sorry. thanks, Bye. Also allow me a meter to tell when I am annoying you especially, to be fair.
If this is part of the First wish or is a Second Wish please advise me now. But I would like to register a system of karma to keep track of pain throughout the world good ideas, good intentions etc. Make it my corporation and interchange karma for wish money etc. To the extent that the Masquerade is beneficial, presently necessary etc. let my wish money grease the wheels for people's pleasure and definitely the minimization of pain. I here state my corporation's purpose is to maximize pleasure, wisely, to minimize unnecessary pain for myself especially but also for my family, friends, town, state, country, continent, landmass, world, universe, multiverse, omni-verse and other beneficial organizations that have cause or will cause me pleasure, as they cause me pleasure.
Masquerade/Camouflage against malevolent or world destroying entities, get shares off of universes that spring up just to mask my current or probable future universe from being ruined. Pay accordingly and reasonably. But trade on relationships. Let future and more experienced me handle this sort of thing. Allow me the fun of a first life. Ugh this can go on but I will stop for now.
Execute My First Wish.