Is that true? What's wrong with black?
Black is reserved for evening and mourning.
OP - Stick with grey or navy. Both are equally versatile, and should serve you for some time. 2 or 3 button is a matter of preference. Pleats are a no-go unless you are carrying extra weight, then perhaps.
+1 to all of this. Center vs. side vent is also a matter of preference, but do not go ventless (as the GQ link says). You see ventless jackets a lot in TV shows and movies because it gives a better silhouette on camera, but in real life they're impractical - too much sitting, moving, etc.
Also, depending on your body type, you may not be able to buy off the rack. Most nested suits (pants and jacket together) come with pants 6" smaller than the jacket size (i.e. 42 jacket, 36 waist in the pants). If you're off either way, most stores sell separates. Frankly, unless your waist is exactly 6" smaller than your chest, separates are probably a good option since you can save some on tailoring.
Agreed on the no pleats, unless there's some extra heft. No pleats means no cuff.
Finally, since you're building a wardrobe, go with solids. One grey/charcoal, one navy. Solids are much more versatile, so you can get by for a while before branching out into stripes and patterns.
I used to sell suits. Hence the unnecessarily long response.
I disagree with the no pleats... While in slacks, pants, etc. pleats look awful, in suits they serve the distinct purpose of allowing you to sit comfortably. Also, good luck finding non-pleated pants with HSM, Hickey Freeman, etc...