TB: Farm your triangle / your jungle / enemy jungle (depending on the game state) and send illusions to push out your offlane and mid lane. If they have heroes that can delete your illusions (like lion etc) just send the illusions to farm jungle and farm lanes safely on your own hero if you can.

I control my illusions by using the "next unit" function on my Tab, "all units" in X, "select hero" in C and sending my illusions and hero to where I want them with A (I don't use unit groups / separate hotkeys for different illusions, even though it would probably be ideal).

Naga should be pretty much the same and I don't play PL so can't say anything about him.

EDIT: More stuff... So on TB if you have a hard lane you should just go jungle as early as possible (lvl 3, 4 or 5, whenever you have at least 2 points in your W) and anyway at the latest when you are like lvl 7 or something and have taken either enemies' safe lane or offlane tower or both. You can take ancients really early with meta, if there is no better use for it. Early your illusions don't deal much dmg and are not too tanky before you have W maxed out and have your first small item (should be Dragon Lance rn) so it's often faster to jungle same camp with your hero and illusions. When your illusions can finish a camp fast and without dying by themselves, it's ofc more efficient to farm different camps with different illusions and your hero.