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Your immigrant visa is no longer relevant. The immigrant visa is single-use and became invalid the moment you entered the US. (The immigrant visa does turn into an I-551 (green card) valid for one year from the date of entry, for you to use before you get the plastic green card; however, that is no longer needed as you already have the plastic green card.)
As a permanent resident, you are not required to have a passport, and whether and when you renew your passport are independent of your permanent resident status.
As a conditional permanent resident, you must apply for Removal of Conditions (ROC) with I-751 before your 2-year conditional permanent resident status expires. You do not apply for a "renewal" of the card with I-90. Normally, if you remain married with your spouse, you and your spouse apply for ROC jointly, and you must file within the 90-day period before your 2-year card's expiration date (which should be 2 years after your entry). You may also apply for ROC yourself on the basis of divorce, or abuse from your spouse, or your spouse's death, in which case you can file it any time (even if more than 90 days before the 2 years ends).
The fee for I-751 is $680 for one person (including the biometrics fee). You must file for Removal of Conditions on time; late filings are only accepted with a good reason.