where do i get the set items, like the hunters and phaladin armors.

also if i was to build a slayer bow (out of YEW eood) and its of exp quality.
would it end up with the slayer property + 35 DI + the yew wood properties.

could you stack runics on top of that?

Set items come as loot off of the new monsters (like parrots do) and as far as I can tell the higher the fame of the monster the better your chances are.

It's impossible to make an exceptional slayer bow. But yes any of the "lower case" craftables can use a runic to stack, hence it is possible to make a double slayer slayer bow. It's the capitalized craftables that you would waste your runic charges making.

i didn't know there was a difference between to the two lower and upper case

so if I killed trogs in mass I might get a set item?

Aye if you kill trogs you have a chance at a set item. If you kill Lurgs your chance goes much higher though.

If you look on your crafting tool you will see some of the new craftables are capitalized. Those are the ones that you would be wasting your runic charges on.