New to site

[gracepeters]

Hi there my name is Grace, I am new to the site and new to orchids. I have recently been given 3!! One a know is a phal, it was labelled, this one has just bloomed and seems to be doing great. Do I leave the stem as is. The second I have no idea, the very fragrant large bloom had just died when it came to me, now the stems of the leaves are turning a mottled brown and yellow and then this gradually goes all the way through the leaf which turns brown. Help!!! The third one has small spiky leaves with a lot of roots growing outside the pot. Seems to be okay. Is this how it is supposed to be. How do I post pictures for you to look at. Phew a newbie who cant stop typing SORRY!