[Elecraft] Fldigi & K3S USB, Windows 10 setup

[Silverwater]

Need setup information of Fldigi in order to receive and transmit with
Hellschreiber (Feld Hell). I am asking about CW too, just to have that
option. 
Anyhow, I'm currently a CW (80%) and SSB operator, I enjoy antenna
design/construction… but I need help with understanding the computer
interface with rigs. (I have had success with digital setups with other rigs
(not Elecraft). I just followed instruction posted by others… but a deep
understanding I didn't have. 
I have the K3s since last November 2015 and have successfully connected/used
the K3 Utility program and now want to use Fldigi with the K3s. 
My first question: Is the USB connection, the only cable needed to interface
my computer to the K3s using Fldigi? 
Other related questions:
Does the USB connection supply the audio received from the K3s to the
computer AND supply the audio out from the computer to the K3s?
If I'm using the K3s USB cable, does the Fldigi use ONLY the K3s's built in
sound card or a combination with the computer's soundcard? 
Should I use Hamlib from the Fdigi configuration, and which check boxes
settings: Audio, DTR, CTS, XON, XOFF, recommended baud rates, stop bits…?
For Hellschreiber and CW modes should I be on DATA A digital mode while
using Fldigi?
If "USB cable ONLY" option is valid, what settings on the K3s need to be
changed for Fldigi? 

Additional Notes: My computer OS: Windows 10. I have chosen for both the
recording/playback : USB Audio CODEC… also the proper COM was chosen.
I have read many previous posts… and tried to understand them in search of
answers to the above questions… but still confused… need more info.  Thank
you for your valuable time!
73, 4x1zz Howard Silverwater




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