sudo apt-get update
sudo apt-get install -y transmission-cli transmission-common transmission-daemon
sudo service transmission-daemon stop

Edit the config file, its pretty self explanatory..

nano /etc/transmission-daemon/settings.json

Big things are DL Dir, and Username/PWD and Accessible IP's

"download-dir": "/mnt/torrents",
"rpc-password": "password",
"rpc-port": 9091,
"rpc-username": "username",
"rpc-whitelist": "127.0.0.1,*.*.*.*",
sudo service transmission-daemon start
http://IP:9091

Windows Client:

https://sourceforge.net/projects/trqtw/files/Transmission-Qt/