Eternal_LE Not going blind. It wouldn't actually let me tag this as a "leveling" build (because it has boss-killer and monolith tags). I'll see if I can add a leveling section regardless (I've also been meaning to flesh out the endgame section a bit more, so I'll lump the effort in with that).
But to give a short answer here, I'd try: For level 10, aim for Skeletons + Golems + Transplant + Bone Curse + Marrow Shards. At level 16, Zombies in for Marrow Shards (and zombies will form the foundation of the build until our abomination is online). 5 Points in Necro, Mages in for Transplant (or skeleton if you prefer movement, as we get the movement on mage very late). At 37 points in Necro, swap in Dread Shade + Infernal Shade for Bone Curse + Skeletons specializations (we don't need these yet, but want to have them in an okay place for when necro comes online and skills level slowly at this level range). At 40 points in Necro, abomination in for golem.
The progression listed on the skill + passive trees should work for the leveling process.
My leveling was all over the place, so I can't say I tried that exact path myself, but it should work. I'll add it to the guide after I verify.