i just hit 100 conjuration and i've already done the quest for the master conjuration.
right now i only have orchendor. i'm still looking for my second thrall
which one do you recommend for me? i'm a mage BTW.

also, what are the things i could do with my orchendor?
i've tried giving him morokei and archmage robe but he doesn't use it.

Dead thralls will not equip any armor or weapons besides the ones they initially had. And as for a second thrall I recommend a Whiterun guard, so that he may return to his adventuring days.

Well to correct the above, if they don't have a weapon at all they will pick one up off the ground, but you can not trade gear with them. So best figure out what you want before you revive them.

You, like me when I got dead thrall have probably passed the point where you could do this, but the best one I've heard was to revive...

College Spoiler

Or revive a necromancer, so they can revive even more dead bodies for you. You could have a small army of undead.