When to start shopping for the unborn baby, and how many weeks should i prepare the shopping list, and needs to be bought first for the new baby boy?

No particular time: You will need diapers, nasal saline and a nasal bulb suction, blankets,some shirts & face cloths. An infant car seat is also a good investment & I recommend a convertible rather than one that doubles as an infant carrier. A convertible can last you 4-5 yrs while they outgrow a carrier in 1.Your friends & family may gift you some of this & you can fill in the rest as you need it.