AutoCad 3D :: Draw Out All Faces Of 3D Object And Then Merge Them Together

Is it easier to draw out all faces of the 3d object and then merge them together later on or is there a method that allows me to be able to dimension and extrude my object as I work from the 3d space?

Say, I created a square and extruded it into a block. Then I want to look at one of the sides and poke 3 holes in it. My problem is I cannot use annotate to change the geometrical constraints on them, like if my circle is out of place or if it is too large or small.( or at least they don't show up for me.)

I'm learning about the UCS system but I thought if I moved the UCS system to the face I want to draw on and change from 3d modeling back to 2d annotation I can go ahead and annotate from that face of interest.