VST setup for usb mike

have just upgraded from version 2 (…) to 7.06 and am struggling.
have set my mac up to record through the internal mike, now want
to change that to a samson USB mike, and still use the headphone send
to listen to midi and audio. forever grateful for help, someone?

I believe there is an article in the Knowledge Base about USB microphones.
Hopefully there is some helpful information there.