Green Card- Petition to Remove Conditions of Residence (I-751)

[letsmakeithappens]

Hello All,

I would like to ask for helps and information regarding in Petitions to Remove Conditions of Residence (I-751). My renewal will be this coming August 2019.
Here are my questions:

1. How SOON should I will submit to USCIS? Could please elaborate to me,...

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I am a professional here, age- 42 yrs.

We have received our greencard in may 2012. ( Myself, my wife and my son – 11 yrs than ). We have visited USA in may 2012, stayed there for 1 month and came back here with return permit.

Now second time, we have to go to USA before...