I'm sure this will not be my last time writing with a question. Our house NEEDS a lot of work! Here's for my first question:
One room of my house is in need of a good paint job. However, the last time it was painted, it was painted over new dry wall and was not primed first. What do I need to do to get the walls ready for my new color? Any help would be SUPER! Thanks.

 

The paint that the drywall soaked up the first time probably sealed the wall. It probably took two coats to look like anything.

So the wall is sealed. You can paint on top of the original paint. If you have fuzzy nibs all over the wall, you can sand them off with some 180 grit paper.

If the sheen and finish of the wall is different in the places where the joint compound was applied, it will help with the appearance of the finish to go back and prime this wall so that the new paint comes out uniformly. Rather than the PVA primer for new sheetrock, try Zinsser 123. You can have the primer tinted toward the color of the finish coat to help with color coverage, if needed. After the primer, one coat will probably be sufficient for your new paint.

Hope this helps.