Ok hidden is relatively easy to get set up, steps below, good luck:

1. First things first, you need source sdk base 2006:
a. hover over the library tab, and select "TOOLS" from the drop down.
b. scroll down and find "Source SDK Base 2006"
c. double click, download and install "Source SDK Base 2006"

2. You'll now need the hidden game type so go to this site and download any of the client "Beta 4b Client Installer"s
http://www.hidden-source.com/downloads.htm

3. COMPLETELY close down steam, make sure the steam icon is not in ur hotkeys next to the clock.

4. Install the Client Installer

5. Once the installer is done, open up steam, and the hidden gametype should be in your game library

6. Watch ur back ;)

Any questions or problems should be directed at me :)

You'll need all below, links will be posted as well:

1. "Sub to ALL" in the TTT workshop page: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=122247544

2. "Sub to ALL" CSS maps: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=123162749

(optional) download maps at ur leisure: http://maps.theterrornetwork.com/

Any questions or problems, see me :)

You'll need the following, to make everything populate in Gmod you'll need to subscribe to the corresponding pages on steam workshop, i'll produce links for everything below as well:

1. Sub to Prop Hunt gametype itself: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=143190159

2. Sub to ALL Prop Hunt maps, there will be a "subscribe to all" button here: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=188219959

3. You'll need to either own or download the resources for Counter strike, if you dont have them, see this youtube video for the files you'll need, and where to put them in ur steam files: https://www.youtube.com/watch?v=dxuw7C3Zs-Q
4. You may add additional maps at ur leisure, and feel free to post the links to them if generosity strikes you, but any other maps you dont have should be auto downloaded as you enter servers with them

Any additional questions or additons to this should be directed to me :)