What is the plan with Daisy and Gatsby?
In The Great Gatsby, there's unfortunately not much of a plan by either Gatsby or Daisy.
Gatsby expects magic to happen, not a plan. He expects the past to repeat itself and Daisy to resume her love (if ever it was love) for him as before the war. It's that simple. He wants her to leave Tom and be his forever: the stuff of trashy romance novels, right?
Daisy is a bit more realistic, but as a temptress she can only do what she does best: tempt men. Daisy is coy and curious, lured to Nick's and Gatsby's by money more than love. Maybe she has feelings for Gatsby, but at least she knows that she can't act on them because she's already married.
She cries over Gatsby's shirts (symbols of money) because she knows she can only have money (Tom), not love and money (Gatsby). The irony is that the idealistic and hopelessly romantic Gatsby thinks these are tears of joy and the past repeating itself.
In matters of the heart, and the heart only, there are no logical or moral plans. These are the careless people of the Lost Generation.
I agree with the first answer, but I wonder if you were asking a slightly different question. When I read the question, I thought that you were asking about Gatsby's plan with regard to Daisy.
His first plan is that he will buy this big house and have huge parties all the time. He hopes that Daisy will just happen to come to one of the parties.
After that, his next plan has to do with Nick. When he finds out Nick knows Daisy, he has Nick invite Daisy over to his house. When Daisy comes, Gatsby will "just happen" to be there as well.
So these are Gatsby's plans for getting to see Daisy again.