[alondra]

surreal just about covered it, clean it down as best you can fill any holes with sheetrock mud ,sand it smooth. I doubt you will ever get it smooth enough for just white paint,
a trick ive used, mix s/r mud thin enough to put it on the wall with a paint roller, then go over with a blade lightly to smooth down the peaks, this covers many ills on the wall.
in fact every new home Ive seen lately have textured walls. they shoot it on. takes less skill and craftmanship. which now a days is in short suppy